Strong's #834: 'aher (pronounced ash-er')
 a primitive relative pronoun (of every gender and number); who, which, what, that; also (as an adverb and a conjunction) when, where, how, because, in order that, etc.:--X after, X alike, as (soon as), because, X every, for, + forasmuch, + from whence, + how(-soever), X if, (so) that ((thing) which, wherein), X though, + until, + whatsoever, when, where (+ -as, -in, -of, -on, -soever, -with), which, whilst, + whither(- soever), who(-m, -soever, -se). As it is indeclinable, it is often accompanied by the personal pronoun expletively, used to show the connection.
Brown-Driver-Briggs Hebrew Lexicon:
 ׁ 
  'ăsher 
 
 1) (relative participle)
 
 1a) which, who
 1b) that which
 
 2) (conjunction)
 
 2a) that (in object clause)
 2b) when
 2c) since
 2d) as
 2e) conditional if
 
  Part of Speech: relative particle
 
 conjunction
 
Relation: a primitive relative pronoun (of every gender and number)
Usage:
This word is used 5448 times:
Deuteronomy 14:25: "and shalt go the place  which the LORD thy God shall choose:"
Deuteronomy 14:26: "And thou shalt bestow that money for whatsoever  for whatsoever thy soul lusteth after, for oxen,"
Deuteronomy 14:26: "for oxen, or for wine, or for strong drink, or for whatsoever  or for whatsoever thy soul desireth:"
Deuteronomy 14:27: "And the Levite  that is within thy gates; thou shalt not forsake him; for part"
Deuteronomy 14:29: "and the fatherless, and the widow,  which are within thy gates, shall come, and shall eat and be satisfied;"
Deuteronomy 14:29: "thee in all the work of thine hand  which thou doest."
Deuteronomy 15:2: "of the release: Every creditor  that aught unto his neighbor"
Deuteronomy 15:3: "Of a foreigner thou mayest exact  it again: but that which is thine with thine hand"
Deuteronomy 15:4: "shall greatly bless thee in the land  which the LORD thy God giveth"
Deuteronomy 15:5: "all these commandments  which I command thee this day."
Deuteronomy 15:6: "the LORD thy God blesseth  thee, as he promised unto many nations,"
Deuteronomy 15:7: "of thy brethren within any in thy land  which the LORD thy God giveth"
Deuteronomy 15:8: "unto him, and shalt surely lend for his need,  in that which he wanteth."
Deuteronomy 15:14: "Thou shalt furnish him liberally out of thy flock, and out of thy floor, and out of thy winepress:  of that wherewith"
Deuteronomy 15:18: "thee six years: and the LORD thy God shall bless thee in all  that thou doest."
Deuteronomy 15:19: "All the firstling males  that come of thy herd thou shalt sanctify"
Deuteronomy 15:20: "year by year  which the LORD shall choose, thou and thy household."
Deuteronomy 16:2: "of the flock and the herd,  which the LORD shall choose to place his name"
Deuteronomy 16:4: "neither shall there any thing of the flesh,  which thou sacrificedst the first day at even,"
Deuteronomy 16:5: "the passover within any  which the LORD thy God giveth"
Deuteronomy 16:6: "But at the place  which the LORD thy God"
Deuteronomy 16:7: "And thou shalt roast and eat it in the place  which the LORD thy God and thou shalt turn"
Deuteronomy 16:10: "with a tribute of thine hand,  which thou shalt give unto the LORD thy God, according as the LORD thy God"
Deuteronomy 16:10: "of thine hand, which thou shalt give  unto the LORD thy God, according as the LORD thy God hath blessed"
Deuteronomy 16:11: "and thy manservant, and thy maidservant, and the Levite  that is within thy gates, and the stranger, and the fatherless, and the widow,"
Deuteronomy 16:11: "and the stranger, and the fatherless, and the widow,  that are among you, in the place which the LORD"
Deuteronomy 16:11: "that are among you, in the place  which the LORD thy God hath chosen to place"
Deuteronomy 16:14: "the stranger, and the fatherless, and the widow,  that are within thy gates."
Deuteronomy 16:15: "unto the LORD thy God in the place  which the LORD shall choose: because the LORD"
Deuteronomy 16:16: "the LORD thy God in the place  which he shall choose; in the feast of unleavened bread, and in the feast"
Deuteronomy 16:17: "shall give as he is able, according to the blessing of the LORD thy God  which"
Deuteronomy 16:18: "shalt thou make thee in all thy gates,  which thy God giveth thee, throughout thy tribes:"
Deuteronomy 16:20: "thou mayest live, and inherit  which the LORD thy God giveth"
Deuteronomy 16:21: "of the LORD thy God,  which thou shalt make"
Deuteronomy 16:22: "Neither shalt thou set thee up any image;  which the LORD thy God"
Deuteronomy 17:1: "thy God any bullock, or sheep,  wherein is blemish, or any evilfavoredness:"
Deuteronomy 17:2: "among you, within any of thy gates  which thy God giveth thee, man"
Deuteronomy 17:2: "thee, man or woman,  that hath wrought wickedness in the sight"
Deuteronomy 17:3: "any of the host of heaven,  which I have not commanded;"
Deuteronomy 17:5: "or that  which have committed that wicked"
Deuteronomy 17:8: "then shalt thou arise, and get thee up into the place  which the LORD thy God shall choose;"
Deuteronomy 17:9: "the Levites, and unto the judge  that shall be in those days, and inquire;"
Deuteronomy 17:10: "And thou shalt do according to the sentence,  which they of that"
Deuteronomy 17:10: "which they of that  which the LORD shall choose shall show"
Deuteronomy 17:10: "shall show thee; and thou shalt observe to do according to all  that they inform"
Deuteronomy 17:11: "According to the sentence of the law  which they shall teach thee, and according to which"
Deuteronomy 17:11: "they shall teach thee, and according to  which they shall tell thee, thou shalt do: thou shalt not decline"
Deuteronomy 17:11: "decline from the sentence  which they shall show thee, to the right hand, nor to the left."
Deuteronomy 17:12: "And the man  that will do presumptuously, and will not hearken the priest"
Deuteronomy 17:14: "thou art come unto the land  which the LORD giveth thee, and shalt possess"