You know that we used to perform Tamattu' with the Messenger of Allah (ﷺ), whereupon he said: It is right, but we entertained fear.
Sahih Muslim Book 15, Hadith 171
← Previous Hadith Exercise restraint in delivering some of your religious verdicts, for you do not know what the Commander of Believers has introduced in the rites (of Hajj) after you (when you were away in Yemen). He (Abu Musa, ) met him (Hadrat Umar) subsequently and asked him (about it), whereupon 'Umar said: I know that Allah's Apostle (May peace be upon him) and also his Companions did that (observed Tamattu'), but I do not approve that the married persons should have intercourse with their wives under the shade of the trees, and then set out for Hajj with water trickling down from their heads.

Sahih Muslim Book 15, Hadith 170 Next Hadith → This hadith has been narrated by Shu'ba with the same chain of transmitters.

Sahih Muslim Book 15, Hadith 172