144
قَدَرُ اللَّهِ وَمَا شَاءَ فَعَلَ
Qadarullahi wama sha'a fa'al
Allah has decreed, and what He wills He does.
From the hadith: "The strong believer is better and more beloved to Allah than the weak believer, and there is good in each. Strive for what benefits you, seek Allah's help and do not give up. If something befalls you, do not say, 'If only I had done such-and-such…', but say this — for 'if' opens the door to the work of Satan."
Source Ṣaḥīḥ Muslim, The Book of Destiny — site no. 6609 Ṣaḥīḥ
Compiler cites Muslim 4/2052