Bulugh al-Maram 1 The Book of Purification كتاب الطهارة 96

وَعَنْ أَنَسِ]بْنِ مَالِكٍ] – رضى الله عنه – { أَنَّ اَلنَّبِيَّ – صلى الله عليه وسلم -اِحْتَجَمَ وَصَلَّى, وَلَمْ يَتَوَضَّأْ } أَخْرَجَهُ اَلدَّارَقُطْنِيُّ, وَلَيَّنَه ُ 1 . 1 – ضعيف. رواه الدارقطني (151-152).

Narrated Anas bin Malik (rad): The Prophet (صلى الله عليه وسلم) had blood extracted from his body and offered the prayer and did not perform (a new) ablution. [Reported by Ad-Daraqutni who graded it Da’if (weak)].