A man from the Companions of the Prophet (ﷺ) came to Umar ibn al-Khattab (may Allah be pleased with him). He bore witness before him that when he (the Prophet) was suffering from a disease of which he died he heard the Messenger of Allah (ﷺ) prohibiting performing of umrah before hajj.
Sunan Abi Dawud Book 11, Hadith 73
← Previous Hadith The Prophet (ﷺ) raised his voice in talbiyah for hajj. When he came (to Mecca) he went round the House (the Ka'bah) and ran between as-Safa and al-Marwah. The narrator Ibn Shawkar said: He did not clip his hair, nor did he take off his ihram due to sacrificial animals. But he commanded those who did not bring sacrificial animals with them to go round the Ka'bah, to run between as-Safa and al-Marwah, to clip their hair, and then put off their ihram. The narrator Ibn Mani' added: Or shave their heads, then take off their ihram."

Sunan Abi Dawud Book 11, Hadith 72 Next Hadith → Mu'awiyah said to the Companions of the Prophet (ﷺ): Do you know that the Messenger of Allah (ﷺ) prohibited from doing so and so (and he prohibited from) riding on the skins of leopards? They said: Yes.

He again said: You know that he prohibited combining hajj and umrah. They replied: This we do not (know). He said: This was prohibited along with other things, but you forgot.

Sunan Abi Dawud Book 11, Hadith 74