Hadith 595

وعن زيد بن ثابت رضي الله عنه أن النبي صلى الله عليه وآله وسلم تجرد لإهلاله واغتسل. رواه الترمذي وحسنه.
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.
Hadith Reference بلوغ المرام / 595
Hadith Grading محدثین: حسن
Hadith Takhrij «أخرجه الترمذي، الحج، باب ما جاء في الاغتسال عند الإحرام، حديث:830.»
Related hadith on this topic
Explanation & Benefits
Shaykh Dr. Abdur Rahman Freywai
1:
This hadith indicates that performing a ritual bath (ghusl) for entering the state of ihram is recommended (mustahabb).
This is the opinion of the majority of scholars,
while some have considered it obligatory (wajib).

Note:
(In the chain of narration, Abdullah bin Ya'qub is of unknown status (majhul al-hal),
but due to supporting narrations and corroborating evidence, this hadith is classified as sahih li ghayrihi.)
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 830