Musnad Abu Ya'la al-Mawsili 133:10

Zakariya ibn Yahya narrated to us, Dawud narrated to us, from Ali ibn Zayd, from Anas ibn Malik, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Shall I not inform you of the people of Paradise?" We said, "Yes." He said, "Every weak person who is deemed weak, possessing two worn-out garments, who is not paid any attention to; if he were to swear by Allah, He would fulfill it for him." Among them is al-Bara' ibn Malik.