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 30:31: " And to them which were in Hebron, and to all the places where David"
1 Samuel 30:31: "were in Hebron, and to all the places  where David and his men"
1 Samuel 31:7: "And when the men of Israel  that were on the other side of the valley, and they that Jordan,"
1 Samuel 31:7: "that were on the other side of the valley,  and they that Jordan, saw that"
1 Samuel 31:11: "of Jabesh-gilead heard  of that which the Philistines"
2 Samuel 1:4: "tell me. And he answered,  That the people are fled from the battle,"
2 Samuel 1:10: "he was fallen: and I took the crown  that was upon his head, and the bracelet that"
2 Samuel 1:10: "was upon his head, and the bracelet  that was on his arm, and have brought them hither"
2 Samuel 1:11: "them; and likewise all  that were with"
2 Samuel 2:3: "And his men  that were with him did David bring up, every man and they dwelt"
2 Samuel 2:4: "saying, That the men of Jabesh-gilead  were they that buried Saul."
2 Samuel 2:5: "unto them, Blessed be ye of the LORD,  that ye have showed this kindness"
2 Samuel 2:6: "will requite you this kindness,  because ye have done this thing."
2 Samuel 2:11: "And the time  that David was king in Hebron"
2 Samuel 2:16: "place was called Helkath-hazzurim,  which is in Gibeon."
2 Samuel 2:18: "was as light of foot as a  wild roe."
2 Samuel 2:23: "that as many as came to the place  where Asahel fell down and died"
2 Samuel 2:24: "to the hill of Ammah,  that lieth before Giah by the way"
2 Samuel 2:32: "and buried him in the sepulcher of his father,  which was in Bethlehem. And Joab and his men went"
2 Samuel 3:8: "Am I a dog's head,  which against Judah do show kindness this day"
2 Samuel 3:9: "and more also,  as the LORD hath sworn to David, even"
2 Samuel 3:14: "my wife Michal,  which I espoused to me for a hundred foreskins of the Philistines."
2 Samuel 3:19: "in Hebron all  that seemed good to Israel, and that seemed good"
2 Samuel 3:20: "made Abner and the men  that were with him a feast."
2 Samuel 3:21: "with thee, and that thou mayest reign over all  that thine heart desireth. And David sent"
2 Samuel 3:23: "When Joab and all the host  that was with him were come, Joab,"
2 Samuel 3:25: "and to know all  that thou doest."
2 Samuel 3:30: "his brother slew Abner, because  because their brother"
2 Samuel 3:31: "and to all  that were with him, Rend your clothes, and gird"
2 Samuel 3:36: "the people took notice of it, and it pleased them: as whatsoever  as whatsoever the king"
2 Samuel 4:8: "the son of Saul thine enemy,  which sought thy life; and the LORD"
2 Samuel 4:9: "and said unto them, As the LORD liveth,  who hath redeemed my soul out of all"
2 Samuel 4:10: "I took hold of him, and slew him in Ziklag,  who thought that I would have given him a reward for his tidings:"
2 Samuel 5:25: "And David did so,  as the LORD had commanded"
2 Samuel 6:2: "and went with all the people  that him from Baale of Judah,"
2 Samuel 6:2: "from thence the ark of God,  whose name is called"
2 Samuel 6:3: "and brought it out of the house of Abinadab  that was in Gibeah: and Uzzah and Ahio,"
2 Samuel 6:4: "And they brought it out of the house of Abinadab  which was at Gibeah, accompanying"
2 Samuel 6:8: "And David was displeased, because  because the LORD had made a breach"
2 Samuel 6:12: "the house of Obed-edom, and all  that pertaineth unto him, because of the ark of God. So David"
2 Samuel 6:17: "it in his place, of the tabernacle  that David had pitched for it: and David offered"
2 Samuel 6:20: "was the king of Israel today,  who uncovered himself today in the eyes of the handmaids"
2 Samuel 6:21: "Michal, It was before the LORD,  which chose me before thy father, and before all"
2 Samuel 6:22: "base in mine own sight: the maidservants  which thou hast spoken of, of them shall I be had in honor."
2 Samuel 7:3: "Go, do  that is in thine heart; for the LORD is with"
2 Samuel 7:7: "In all  the places wherein I have walked with all the children of Israel I a word"
2 Samuel 7:7: "any of the tribes of Israel,  whom I commanded to feed my people"
2 Samuel 7:9: "And I was with thee whithersoever  thee whithersoever thou wentest, and have cut off"
2 Samuel 7:9: "and have made thee a great name, like unto the name of the great  men that are in the earth."
2 Samuel 7:10: "of wickedness afflict them any more,  as formerly,"