وَعَنْ أَنَسِ]بْنِ مَالِكٍ] رضى الله عنه
«أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ اِحْتَجَمَ وَصَلَّى، وَلَمْ يَتَوَضَّأْ»
The Prophet (sallallahu alayhi wa sallam) had blood extracted from his body and offered the prayer and did not perform (a new) ablution.
Bulugh al-Maram 96, Book 1, The Book of Purification, Hadith 96. 1 min read