Strong's #1722: en (pronounced en)
 a primary preposition denoting (fixed) position (in place, time or state), and (by implication) instrumentality (medially or constructively), i.e. a relation of rest (intermediate between 1519 and 1537); "in," at, (up-)on, by, etc.:--about, after, against, + almost, X altogether, among, X as, at, before, between, (here-)by (+ all means), for (... sake of), + give self wholly to, (here-)in(-to, -wardly), X mightily, (because) of, (up-)on, (open-)ly, X outwardly, one, X quickly, X shortly, (speedi-)ly, X that, X there(-in, -on), through(-out), (un-)to(-ward), under, when, where(-with), while, with(-in). Often used in compounds, with substantially the same import; rarely with verbs of motion, and then not to indicate direction, except (elliptically) by a separate (and different) preposition.
Thayer's Greek Lexicon:
 ̓ 
 
  en 
 
 1) in, by, with etc.
 
  Part of Speech: preposition
Relation: a primary preposition denoting (fixed) position (in place, time or state), and (by implication) instrumentality (medially or constructively), i.e. a relation of rest (intermediate between G1519 and G1537)
  Citing in TDNT: 2:537, 233
 
Usage:
This word is used 2731 times:
Matthew 21:12: "them that sold and bought  in the temple, and overthrew"
Matthew 21:14: "the lame came to him  in the temple; and he healed"
Matthew 21:15: "the children crying  in the temple, and saying,"
Matthew 21:19: "and found nothing  thereon, but leaves only,"
Matthew 21:22: "all things, whatsoever ye shall ask  in prayer, believing, ye shall receive."
Matthew 21:23: "unto him as he was teaching, and said,  By what authority doest thou these things?"
Matthew 21:24: "I in likewise will tell you  by what authority I do these things."
Matthew 21:27: "Neither tell I you  by what authority I do"
Matthew 21:28: "go work today  in my vineyard."
Matthew 21:32: "came unto you  in the way of righteousness, and ye believed"
Matthew 21:33: "hedged it round about, and digged a winepress  in it, and"
Matthew 21:38: "the son, they said  among themselves, This is the"
Matthew 21:41: "him the fruits  in their seasons."
Matthew 21:42: "unto them, Did ye never read  in the Scriptures, The stone which"
Matthew 21:42: "the Lord's doing, and it is marvelous  in our eyes?"
Matthew 22:1: "and spake unto them again  by parables, and said,"
Matthew 22:15: "how they might entangle him  in his talk."
Matthew 22:16: "the way of God  in truth, neither carest"
Matthew 22:28: "Therefore  in the resurrection whose wife shall she be of the"
Matthew 22:30: "For  in the resurrection they neither marry, nor are given in marriage,"
Matthew 22:30: "as the angels of God  in heaven."
Matthew 22:36: "which is the great commandment  in the law?"
Matthew 22:37: "the Lord thy God  with all thy heart, and"
Matthew 22:37: "thy heart, and  with all thy soul, and"
Matthew 22:37: "thy soul, and  with all thy mind."
Matthew 22:40: " On these two commandments hang all the law"
Matthew 22:43: "How then doth David  in spirit call him Lord,"
Matthew 23:6: "love the uppermost rooms  at feasts, and the chief seats"
Matthew 23:6: "and the chief seats  in the synagogues,"
Matthew 23:7: "And greetings  in the markets, and to be called of"
Matthew 23:9: "your Father, which  is in heaven."
Matthew 23:16: "which say, Whosoever shall swear  by the temple, it is"
Matthew 23:16: "nothing; but whosoever shall swear  by the gold"
Matthew 23:18: "And, Whosoever shall swear  by the altar, it is"
Matthew 23:18: "nothing; but whosoever sweareth  by the gift"
Matthew 23:20: "Whoso therefore shall swear  by the altar, sweareth by it,"
Matthew 23:20: "by the altar, sweareth  by it, and by"
Matthew 23:20: "sweareth by it, and  by all things thereon."
Matthew 23:21: "And whoso shall swear  by the temple, sweareth by it, and"
Matthew 23:21: "the temple, sweareth  by it, and by him that dwelleth therein."
Matthew 23:21: "by it, and  by him that dwelleth therein."
Matthew 23:22: "And he that shall swear  by heaven, sweareth by the throne"
Matthew 23:22: "by heaven, sweareth  by the throne of God, and"
Matthew 23:22: "throne of God, and  by him that sitteth thereon."
Matthew 23:30: "say, If we had been  in the days of our fathers,"
Matthew 23:30: "have been partakers with them  in the blood of the"
Matthew 23:34: "and some of them shall ye scourge  in your synagogues, and"
Matthew 23:39: "till ye shall say, Blessed is he that cometh  in the name of the Lord."
Matthew 24:14: "of the kingdom shall be preached  in all the world for"
Matthew 24:15: "the prophet, stand  in the holy place, (whoso readeth, let him understand:)"