Musnad Ahmad 471:0

Narrated to us by Yahya ibn Sa’id, from Shu’bah, who said: Narrated to us Qatadah, from Anas, that Ibn Murabba’ al-Ansari said: "The Messenger of Allah (ﷺ) came to us, and he was in a state of Ihram for Umrah." He said: "So he stayed with us, and he did not cease to be in a state of Ihram until he performed the Umrah."