عَنْ أَنَسِ بْنِ مَالِكٍ رضى الله عنه
قَالَ: «كَانَ أَصْحَابُ رَسُولِ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ --عَلَى عَهْدِهِ يَنْتَظِرُونَ اَلْعِشَاءَ حَتَّى تَخْفِقَ رُؤُوسُهُمْ، ثُمَّ يُصَلُّونَ وَلَا يَتَوَضَّئُونَ»
The Companions of the Messenger of Allah (sallallahu alayhi wa sallam) in his lifetime used to wait for the Isha (night) prayer, so much so that their heads were lowered down (by dozing). They would then pray without performing ablution.
Bulugh al-Maram 77, Book 1, The Book of Purification, Hadith 77. 1 min read