Verses with the word constantly in the New Testament (2 verses):

Acts 12:15
And they said unto her, Thou art mad. But she constantly affirmed that it was even so. Then said they, It is his angel.

Titus 3:8
This is a faithful saying, and these things I will that thou affirm constantly, that they which have believed in God might be careful to maintain good works. These things are good and profitable unto men.