Mukhtasar Bukhari

(Nafi narrates that) Sayyiduna Ibn Umar (may Allah be pleased with them) would not eat food until a needy person joined him in eating. One day I brought a needy person, he started eating with him and ate a lot of food. Sayyiduna Ibn Umar (may Allah be pleased with them) said to his servant (Nafi), "Now do not bring him to me, because I heard the Prophet Muhammad (peace and blessings be upon him) say: 'A believer eats in one intestine, and a disbeliever eats in seven intestines (i.e., eats to his fill).'”