In Ṣaḥīḥ al-Bukhārī it is narrated from Anas:

“I once went to the Prophet—peace and blessings be upon him—carrying some barley bread and a piece of rancid clarified fat. He had, in fact, pawned his coat of mail to a Jew in order to obtain barley for his family. I heard him say, ‘That evening, the family of Muḥammad had neither a sāʿ of wheat nor a sāʿ of other grain, and at that time they comprised nine households.’ ”

The same collection records from ʿĀʾisha, who said:

“The Prophet’s bedding was a leather mat stuffed with palm fiber.”

And in Ṣaḥīḥ Muslim, in the ḥadīth of ʿUmar ibn al-Khaṭṭāb—may Allah be pleased with him—concerning the Prophet’s seclusion from his wives, he said:

“I entered upon the Messenger of Allah—peace and blessings be upon him—in his storeroom and found him lying on a reed mat. He drew his waist-wrapper toward himself and sat up, and the mat had left its imprint on his side. I then looked around his house and saw nothing to catch the eye except a single handful of barley…”