Hadithcore
Bulugh al-Maram, 730

Zaid bin Thabit (RAA) narrated, ‘When the Messenger of Allah (ﷺ) intended to make Ihram for Hajj, he would wash, and take off his ordinary clothes (and put on his white Ihram)." Related by At-Tirmidhi who declared it to be Hadith-Hasan.

وَعَنْ زَيْدِ بْنِ ثَابِتٍ ‏- رضى الله عنه ‏- { أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-تَجَرَّدَ لِإِهْلَالِهِ وَاغْتَسَلَ } رَوَاهُ اَلتِّرْمِذِيُّ وَحَسَّنَهُ [1]‏ .‏

References2 variants
In-Book Reference
Book 6, Hadith 23
English Reference
Book 6, Hadith 749