Appears 3 times in the Quran.
8:9 إِذْ تَسْتَغِيثُونَ رَبَّكُمْ فَٱسْتَجَابَ لَكُمْ أَنِّى مُمِدُّكُم بِأَلْفٍ مِّنَ ٱلْمَلَٰٓئِكَةِ مُرْدِفِينَ
When you sought aid from your Lord, so He answered you: I will assist you with a thousand of the angels following one another.
Say: Maybe there may have drawn near to you somewhat of that which you seek to hasten on.
What must happen afterwards shall follow it.