Riyad as-Salihin 513
Ibn 'Abbas (May Allah be pleased with them) reported:
The Messenger of Allah (ﷺ) went to bed hungry for several successive nights, nor did his family have a thing for supper for many consecutive nights; and their bread was mostly of barley. [At- Tirmidhi, who classified it as Hadith Hasan Sahih] .
وعن ابن عباس رضي الله عنهما قال ‏:‏ كان رسول الله صلى الله عليه وسلم  يبيت الليالي المتتابعه طاويا، وأهله لايجدون عشاء ، وكان أكثر خبزهم خبز الشعير ‏.‏ ‏(‏‏(‏رواه الترمذي وقال ‏:‏ حديث حسن صحيح‏)‏‏)‏‏.‏