عَنْ أَبِي أُمَامَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «عَلَيْكُمْ بِقِيَامِ اللَّيْلِ فَإِنَّهُ دَأْبُ الصَّالِحِينَ قَبْلَكُمْ وَهُوَ قُرْبَةٌ لَكُمْ إِلَى رَبِّكُمْ وَمَكْفَرَةٌ لِلسَّيِّئَاتِ وَمَنْهَاةٌ عَنِ الْإِثْمِ» . رَوَاهُ التِّرْمِذِيّ

Abu Umama said that God’s Messenger was asked which supplication was most readily listened to, and replied, “One made in the course of the latter part of the night, and after the prescribed prayers.” Tirmidhi transmitted it.