Praise be to Allah,
Hushaym narrated to us from Humayd at-Taweel who said that he had heard Anas ibn Maalik say,
“I asked Anas ibn Maalik ‘Did the Messenger of Allah (peace and blessings be on him) ever pray with his shoes on?’ He said, ‘Yes.”‘
(Musnad Ahmad, Vol. 3, p. 100. The isnaad of this Hadeeth is Saheeh according to the conditions set by al-Bukhaaree and Muslim.)
Source:
Thulaathiyyaat Musnad Ahmad ibn Hanbal (may Allah have mercy on him)
Reports of Imaam Ahmad that have only three narrators between him and the Prophet, peace, and blessings be upon him.
Shaykh Muhammad ibn Ahmad ibn Saalim as–Saffaareenee al–Hanbalee ~(1114 –1188 AH)