Bible verses about "slumber" | NHEB
Proverbs 6:10-11
2 John 1:9-11
9 Whoever goes on and does not remain in the teaching of Christ, does not have God. He who remains in the teaching, the same has both the Father and the Son.
10 If anyone comes to you, and does not bring this teaching, do not receive him into your house, and do not welcome him,
11 for he who welcomes him participates in his evil works.