Sunan at-Tirmithiy كتاب الجنائز باب ما جاء فى عيادة المريض
Abū-Fākhitah said, "'Alī [Ibn-Abū-Ṭālib] took me by the hand and said, 'Let us go and attend to al-Ḥasan (who was sick).' We found Abū-Mūsā there, and 'Alī, peace be upon him, asked him, 'Abū-Mūsā, have you come to attend to him or to pay him an ordinary visit?' Abū-Mūsā replied, 'To attend to him.' 'Alī, then said 'I heard the Messenger of God, peace and blessings of God be upon him, say,"Any Muslim who attends to another [ailing] Muslim in the early morning, has seventy-thousand angels praying for [the forgiveness of] that person until nightfall. And if one attends to [an ailing Muslim] in the evening, seventy-thousand angels pray for that person until the morning, and [the attendant] will have an orchard in Paradise."" Click on ḥadīth to read more