Quran 5:52 — The Feast (Al-Ma'edah)

You will see those who harbor doubt in their hearts hasten to join them, saying, "We fear lest we may be defeated." May GOD bring victory, or a command from Him, that causes them to regret their secret thoughts.

[5:51] O you who believe, do not take certain Jews and Christians as allies; these are allies of one another. Those among you who ally themselves with these belong with them. GOD does not guide the transgressors.

[5:53] The believers will then say, "Are these the same people who swore by GOD solemnly that they were with you?" Their works have been nullified; they are the losers.