Verses with the word astray in the New Testament (4 verses):

Matthew 18:12
How think ye? if a man have an hundred sheep, and one of them be gone astray, doth he not leave the ninety and nine, and goeth into the mountains, and seeketh that which is gone astray?

Matthew 18:13
And if so be that he find it, verily I say unto you, he rejoiceth more of that sheep, than of the ninety and nine which went not astray.

1 Peter 2:25
For ye were as sheep going astray; but are now returned unto the Shepherd and Bishop of your souls.

2 Peter 2:15
Which have forsaken the right way, and are gone astray, following the way of Balaam the son of Bosor, who loved the wages of unrighteousness;