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:
1 Samuel 20:36: "now  which I shoot. And as the lad ran,"
1 Samuel 20:37: "to the place of the arrow  which had shot, Jonathan cried"
1 Samuel 20:40: "his artillery unto  his and said unto him, Go, carry"
1 Samuel 20:42: "to David, Go in peace,  forasmuch as both of us in the name"
1 Samuel 21:2: "any thing of the business  whereabout I send thee, and what I have commanded"
1 Samuel 21:2: "whereabout I send  thee, and what I have commanded thee: and I have appointed my servants to"
1 Samuel 21:7: "was Doeg, an Edomite, the chiefest of the herdsmen  that belonged to Saul."
1 Samuel 21:9: "The sword of Goliath the Philistine,  whom in the valley of Elah, behold,"
1 Samuel 22:2: "that was in distress, and every one  that and every one that was discontented,"
1 Samuel 22:3: "and my mother, I pray thee, come forth, and be with you, till  you, till I know what"
1 Samuel 22:6: "David was discovered, and the men  that were with him, (now Saul abode in Gibeah"
1 Samuel 22:11: "his father's house, the priests  that were in Nob: and they came all of them to"
1 Samuel 22:23: "me, fear not: for  he that my life seeketh"
1 Samuel 23:11: "into his hand? will Saul come down,  as thy servant hath heard? O LORD God"
1 Samuel 23:13: "arose and departed and went  whithersoever they could go. And it was told"
1 Samuel 23:19: "in the wood, in the hill of Hachilah,  which is on the south of Jeshimon?"
1 Samuel 23:22: "and see his place  where his haunt is, and who hath seen"
1 Samuel 23:23: "therefore, and take knowledge of all the lurking places  where he hideth himself, to"
1 Samuel 24:1: "And it came to pass,  when Saul was returned from following the Philistines,"
1 Samuel 24:4: "unto him, Behold the day  of which the LORD said unto thee, Behold,"
1 Samuel 24:4: "thine enemy into thine hand, that thou mayest do  to him as it shall seem good unto thee. Then David arose,"
1 Samuel 24:5: "afterward, that David's heart smote him, because  him, because"
1 Samuel 24:10: "thine eyes have seen  how that the LORD had delivered thee today into mine hand"
1 Samuel 24:13: " As saith the proverb of the ancients, Wickedness proceedeth"
1 Samuel 24:18: "hast showed this day  how that thou hast dealt with me:"
1 Samuel 24:18: "with me:  forasmuch as when the LORD had delivered me into thine hand, thou killedst"
1 Samuel 24:19: "reward thee good for  that thou hast done unto me this day."
1 Samuel 25:6: "and peace be unto all  that"
1 Samuel 25:7: "thou hast shearers: now thy shepherds  which were with us, we hurt them not,"
1 Samuel 25:8: "give, I pray thee,  whatsoever cometh to thine hand unto thy servants, and to thy son"
1 Samuel 25:11: "my bread, and my water, and my flesh  that for my shearers, and give it unto men,"
1 Samuel 25:11: "for my shearers, and give it unto men,  whom I know not whence"
1 Samuel 25:21: "have I kept  that this fellow hath in the wilderness, so that nothing"
1 Samuel 25:21: "so that nothing was missed of all  that pertained unto him: and he hath requited me evil"
1 Samuel 25:22: "if I leave of all  that pertain to him by the morning light any that pisseth"
1 Samuel 25:25: "thine handmaid saw not the young men of my lord,  whom thou didst send."
1 Samuel 25:26: "liveth, and as thy soul liveth,  seeing the LORD hath withheld thee from coming"
1 Samuel 25:27: "And now this blessing  which thine handmaid hath brought let it even be given"
1 Samuel 25:30: "according to all the good  that he hath spoken concerning thee, and shall have appointed thee ruler"
1 Samuel 25:32: "be the LORD God  which sent thee this day to meet"
1 Samuel 25:33: "be thy advice, and blessed be thou,  which hast kept day from coming"
1 Samuel 25:34: "God of Israel liveth,  which from hurting thee, except"
1 Samuel 25:35: "received of her hand  that which she had brought unto her, Go up"
1 Samuel 25:39: "he said, be the LORD,  that hath pleaded the cause of my reproach"
1 Samuel 25:44: "to Phalti the son of Laish,  which was of Gallim."
1 Samuel 26:3: "pitched in the hill of Hachilah,  which is before by"
1 Samuel 26:5: "and came to the place  where had pitched: and David"
1 Samuel 26:5: "and David beheld the place  where Saul lay,"
1 Samuel 26:11: "take thou now the spear  that is at his bolster, and the cruse"
1 Samuel 26:16: "thing is not good  that thou hast done. liveth, ye"