Sahih al-Bukhari Book 78, Hadith 12
My father, seeing a silken cloak being sold, said, "O Allah's Messenger (ﷺ)! Buy this and wear it on Fridays
and when the foreign delegates pay a visit to you." He said, "This is worn only by that person who
will have no share in the Hereafter." Later a few silken cloaks were given to the Prophet (ﷺ) as a gift, and
he sent one of those cloaks to `Umar. `Umar said (to the Prophet), "How can I wear it while you have
said about it what you said?" The Prophet (ﷺ) said, "I did not give it to you to wear but to sell or to give to
someone else to wear." So `Umar sent it to his (pagan) brother who was from the inhabitants of Mecca
before he (`Umar's brother) embraced Islam.
That Heraclius sent for him and said, "What did he, i.e. the Prophet (ﷺ) order you?" I replied, "He orders us to offer prayers; to give alms; to be chaste; and to keep good relations with our relatives.
It was said" "O Allah's Messenger! Inform me of a deed which will make me enter Paradise."
(continues through a different chain in the next hadith)