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 17:14: "over me, like as all the nations  that are about"
Deuteronomy 17:15: "Thou shalt in any wise set him king over  thee, whom the LORD thy God"
Deuteronomy 17:15: "thee: thou mayest not set a stranger over  thee, which is not"
Deuteronomy 18:2: "their brethren: the LORD  as he hath said"
Deuteronomy 18:6: "from any of thy gates out of all  where he"
Deuteronomy 18:6: "and come with all the desire of his mind unto the place  which the LORD"
Deuteronomy 18:9: "art come into the land  which thy God giveth thee, thou shalt not"
Deuteronomy 18:14: "For these nations,  which thou shalt possess,"
Deuteronomy 18:16: "According to all  that thou desiredst of the LORD thy God"
Deuteronomy 18:17: "said unto me, They have well  spoken that which they have spoken."
Deuteronomy 18:18: "and he shall speak unto them all  that I shall command"
Deuteronomy 18:19: "And it shall come to pass, that whosoever  that whosoever will not hearken unto my words"
Deuteronomy 18:19: "will not hearken unto my words  which he shall speak in my name, I"
Deuteronomy 18:20: "But the prophet,  which shall presume to speak a word"
Deuteronomy 18:20: "a word  which I have not commanded him to speak, or that"
Deuteronomy 18:20: "I have not commanded him to speak,  or that shall speak in the name of other gods,"
Deuteronomy 18:21: "shall we know  which the LORD hath not spoken?"
Deuteronomy 18:22: " When a prophet speaketh in the name of the LORD, if the thing not,"
Deuteronomy 18:22: "come to pass, that is the thing  which the LORD hath not spoken, but the prophet"
Deuteronomy 19:1: "hath cut off the nations,  whose land the LORD thy God"
Deuteronomy 19:2: "cities for thee in the midst of thy land,  which thy God giveth thee to possess"
Deuteronomy 19:3: "the coasts of thy land,  which the LORD thy God giveth thee to inherit, into three parts, that every"
Deuteronomy 19:4: "And this is the case of the slayer,  which shall flee thither, Whoso"
Deuteronomy 19:4: "shall flee thither,  Whoso killeth his neighbor ignorantly,"
Deuteronomy 19:5: " As when a man goeth into the wood with his neighbor to hew and his hand"
Deuteronomy 19:8: "enlarge thy coast,  as he hath sworn unto thy fathers, and give thee"
Deuteronomy 19:8: "thee all the land  which he promised to give unto thy fathers;"
Deuteronomy 19:9: "these commandments  them, which I command thee this day, to love"
Deuteronomy 19:10: "shed in thy land,  which the LORD thy God giveth thee for an inheritance,"
Deuteronomy 19:14: "remove thy neighbor's landmark,  which they of old time in thine inheritance, which"
Deuteronomy 19:14: "they of old time in thine inheritance,  which thou shalt inherit in the land that the LORD"
Deuteronomy 19:14: "which thou shalt inherit in the land  that the LORD thy God giveth thee to possess"
Deuteronomy 19:15: "sin, in any sin  that he sinneth: at the mouth of two"
Deuteronomy 19:17: "Then both the men,  between whom the controversy is, shall stand before before"
Deuteronomy 19:17: "before the priests and the judges,  which shall be in those days;"
Deuteronomy 19:19: "Then shall ye do  unto him, as he had thought to have done unto his brother: so shalt thou put the evil away"
Deuteronomy 20:5: "saying, What  is there that hath built a new house, and hath not"
Deuteronomy 20:6: "And what man  is he that hath planted a vineyard, and hath not of it? let him also go"
Deuteronomy 20:7: "And what man  is there that hath betrothed a wife, and hath not her? let him go"
Deuteronomy 20:14: "and the little ones, and the cattle, and all  that in the city, even all the spoil"
Deuteronomy 20:14: "the spoil of thine enemies,  which the LORD thy God hath given"
Deuteronomy 20:15: "which are very far off  thee, which are not of the cities of these"
Deuteronomy 20:16: "of the cities of these people,  which the LORD doth give"
Deuteronomy 20:17: "the Canaanites, and the Perizzites, and the Jebusites;  as the LORD thy God hath commanded"
Deuteronomy 20:18: "That  That they teach you not to do after all their abominations,"
Deuteronomy 20:18: "you not to do after all their abominations,  which they have done unto their gods; so should ye sin"
Deuteronomy 20:20: "Only the trees  which thou knowest that they trees"
Deuteronomy 20:20: "bulwarks against the city  that maketh war with"
Deuteronomy 21:1: "one be found slain in the land  which the LORD giveth thee to possess"
Deuteronomy 21:2: "and they shall measure unto the cities  which are round about him that is slain:"