At-Talaq

And whosoever fears God, He will appoint for him a way out,and He will provide for him from whence he never reckoned. And whosoever puts his trust in God, He shall suffice him. God attains his purpose. God has appointed a measure for everything.[65:3]

This verse was revealed about 'Awf ibn Malik al-Ashja'i whose son was imprisoned by the idolaters. He went to the Messenger of Allah, Allah bless him and give him peace, and complained to him about his poverty, saying: “The enemy has imprisoned my son and his mother is very distressed, what do you advise me to do?” The Prophet, Allah bless him and give him peace, said to him: “Be fearful of Allah and be patient. I also command you and your wife to often repeat 'there is no strength or might except by Allah' ” - la hawla wala quwwata illa billah. So he went home and said to his wife: “The Messenger of Allah, Allah bless him and give him peace, commanded both of us to often repeat 'there is no strength or might except by Allah' ”. She said: “How good is that with which he has commanded us!” And they both started saying it straightaway. It happened that the enemy became distracted from their son and the latter led their sheep away and fled. He brought these sheep to his father; they were four thousand heads.

Asbab Al-Nuzul by Al-Wahidi