7 - some examples from Revelation

1. Seven churches in Asia (Revelation 1-3)
2. Seven spirits that are before Christ's throne also described as seven lamps (Revelation 1:11, 3:1, 4:5)
3. Seven golden lampstands, representing the churches and among which Jesus walks (Revelation 1:12, etc)
4. Seven stars held in Christ's right hand, representing the angels of the churches (Revelation 1:16, 20)
5. Seven seals on the scroll opened by the Lamb (Revelation 5:1, 5)
6. Seven horns and eyes, the number the Lamb has and that are the seven spirits (Reveltaion 5:6)
7. Seve trumpets blown by seven angeels (Revelation 8:2, 6)
8. Seven thunders that spoke and whose words were not recorded (Revelation 10:3, 4)
9. Seven heads with seven crowns are the number on the great red dragon and seven heads with no crowns the number on the beast (Revelation 12:3, 13:1)
10. Seven plagues in seven bowls full of God's wrath poured out on earth by seven angels (Revelation 15:1, 6-8, 16:1, 17:1)

(Seven heads are also found on the beast the woman rides. These are seven hills and seven kings, five already fallen (Revelation 17:3, 7-11))

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)