مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1916
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn "Abbas said: The Messenger of Allah (ﷺ) said - and on one occasion he said: I heard the Prophet (ﷺ) deliver a speech and say -: "Whoever cannot find sandals, let him wear khuffain (leather slippers), and whoever cannot find an izar (waist wrapper), let him wear pants."
Musnad Ahmad 1917Sahih (Darussalam) [ al-Bukhari (1841) and Muslim (1178)]