It wasnarrated that 'Umar bin Al-Khattab said:
"The Prophet (ﷺ)saidto me: 'When you enter upon one who is sick, tell him to pray foryou, for his supplication is like the supplication of the angels.'" (FR)
English reference (FR): Vol. 1, Book 6, Hadith 1441 (FR)
Arabic reference (FR): Book 6, Hadith 1508 (FR)