7 - some examples from the New Testament

1. Seven loaves (and a few small fish) are used by Jesus to feed the four thousand and a few basketfuls of left overs remain (Matthew 15, etc)
2. Seven times is the number of times in a day a person may sin against us and if they repent we are to forgive them (Luke 17:4, see also Matthew 18:21, 22)
3. Seven brothers are the number suggested by the sceptical Sadducees who marry the same woman in Matthew 22, etc.
4. Seven demons are the number that came out of Mary Magdalene (Luke 8:2; Mark 16:9)
5. Seven years is the length of time Anna the prophet was married before she became a widow (Luke 2:36)
6. Seven men are the number of men chosen by the early believers to be responsible for practical matters (Acts 6)
7. Seven sons of Sceva, a Jewish chief priest, are the ones who were casting out demons in the name of Jesus and Paul (Acts 19:14)
8. Seven days is the length of time Paul stayed in Troas in Acts 20:6
9. Seven days is also the length of time Paul spent in Tyre in Acts 21:4 
10. Seven days is the time Paul had been in Jerusalem when some Jews from the province of Asia saw him at the temple and stirred up the whole crowd and seized him (Acts 21:27)