Surah Muhammad Verse 21 - English Translation by Muhammad Sarwar
Surah Muhammadطَاعَةٞ وَقَوۡلٞ مَّعۡرُوفٞۚ فَإِذَا عَزَمَ ٱلۡأَمۡرُ فَلَوۡ صَدَقُواْ ٱللَّهَ لَكَانَ خَيۡرٗا لَّهُمۡ
Since they have (pledged) Us obedience and to speak reasonably, it would be more proper for them, when it is decided (that everyone must take part in the battle), to remain true (in their pledge to God)