Musnad Ahmad 5:35

Sufyan narrated to us, from ‘Ata’ ibn al-Sa’ib, from his father, from ‘Ali, who said: The Prophet (peace and blessings of Allah be upon him) said: "I will not give to you and leave the people of the Suffah with their stomachs twisting from hunger." And he said once: "I will not serve you both and leave the people of the Suffah hungry."