Quran 5:52 — The Feast (Al-Ma'edah)

فَتَرَى الَّذينَ فى قُلوبِهِم مَرَضٌ يُسٰرِعونَ فيهِم يَقولونَ نَخشىٰ أَن تُصيبَنا دائِرَةٌ ۚ فَعَسَى اللَّهُ أَن يَأتِىَ بِالفَتحِ أَو أَمرٍ مِن عِندِهِ فَيُصبِحوا عَلىٰ ما أَسَرّوا فى أَنفُسِهِم نٰدِمينَ

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.