وَعِنْدَهُمَا مِنْ حَدِيثِ جَابِرٍ: «وَالْعِشَاءَ أَحْيَانًا وَأَحْيَانًا: إِذَا رَآهُمْ اِجْتَمَعُوا عَجَّلَ، وَإِذَا رَآهُمْ أَبْطَئُوا أَخَّرَ، وَالصُّبْحَ: كَانَ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُصَلِّيهَا بِغَلَسٍ»
used to advance the Isha prayer sometimes and delay it at other times. Whenever he saw the people assembled (for the Isha prayer) he would pray early and if the people delayed, he would delay the prayer. And the Prophet (sallallahu alayhi wa sallam) used to offer the Fajr prayer when it was still dark.
Bulugh al-Maram 184, Book 2, The Book of Prayer, Hadith 5. 1 min read