Surah Al-Ahzab (The Enemy Alliance), Verse 18

قَدْ یَعْلَمُ اللّٰهُ الْمُعَوِّقِیْنَ مِنْكُمْ وَالْقَآىِٕلِیْنَ لِاِخْوَانِهِمْ هَلُمَّ اِلَیْنَا وَلَا یَاْتُوْنَ الْبَاْسَ اِلَّا قَلِیْلًا ۟

Qad ya'lamul laahul mu'awwiqeena minkum walqaaa'ileena li ikhwaanihim halumma ilainaa, wa laa yaatoonal baasa illaa qaleelaa

“Verily Allah knows those among you who keep back (men) and those who say to their brethren, "Come along to us", but come not to the fight except for just a little while.”

Quran 33:18 (Yusuf Ali Translation)