Hadithcore
Sahih al-Bukhari, 1124
sahih

Narrated Jundab:

The Prophet (ﷺ) became sick and did not get up (for Tahajjud prayer) for a night or two.

حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ الأَسْوَدِ، قَالَ سَمِعْتُ جُنْدَبًا، يَقُولُ اشْتَكَى النَّبِيُّ صلى الله عليه وسلم فَلَمْ يَقُمْ لَيْلَةً أَوْ لَيْلَتَيْنِ‏.‏

References2 variants
In-Book Reference
Book 19, Hadith 4
USC-MSA web (English) reference
Vol. 2, Book 21, Hadith 224 (deprecated numbering scheme)