Acts 2:21

"And it shall come to pass, that whosoever shall call on the name of the Lord shall be saved."
Acts 2:21 (KJV)

Context from Acts 2

19

And I will shew wonders in heaven above, and signs in the earth beneath; blood, and fire, and vapour of smoke:

20

The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:

21

And it shall come to pass, that whosoever shall call on the name of the Lord shall be saved.

22

Ye men of Israel, hear these words; Jesus of Nazareth, a man approved of God among you by miracles and wonders and signs, which God did by him in the midst of you, as ye yourselves also know:

23

Him, being delivered by the determinate counsel and foreknowledge of God, ye have taken, and by wicked hands have crucified and slain: