Hadith 516790
Chapter 49: The Description of the Prophet, may Allah Bless Him and Grant Him Peace - كتاب صفة النبى صلى الله عليه وسلم
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عِيسَى ابْنَ مَرْيَمَ، كَانَ يَقُولُ يَا بَنِي إِسْرَائِيلَ عَلَيْكُمْ بِالْمَاءِ الْقَرَاحِ وَالْبَقْلِ الْبَرِّيِّ وَخُبْزِ الشَّعِيرِ وَإِيَّاكُمْ وَخُبْزَ الْبُرِّ فَإِنَّكُمْ لَنْ تَقُومُوا بِشُكْرِهِ .
Yahya related to me from Malik that he had heard that Isa ibn Maryam used to say, "O Banu Israil! You must drink pure water and the green things of the land and barley bread . Beware of wheat bread, for you will not be grateful enough for it."
Reference Muwatta Malik 516790
USC-MSA web (English) reference : Book 49, Hadith 27