Quran 33:14 — The Parties (Al-Ahzab)

وَلَو دُخِلَت عَلَيهِم مِن أَقطارِها ثُمَّ سُئِلُوا الفِتنَةَ لَءاتَوها وَما تَلَبَّثوا بِها إِلّا يَسيرًا

Had the enemy invaded and asked them to join, they would have joined the enemy without hesitation.

[33:13] A group of them said, "O people of Yathrib, you cannot attain victory; go back." Others made up excuses to the prophet: "Our homes are vulnerable," when they were not vulnerable. They just wanted to flee.

[33:15] They had pledged to GOD in the past that they would not turn around and flee; making a pledge with GOD involves a great responsibility.