Yahya related to me from Malik from Ishaq ibn Abdullah ibn AbiTalha that Anas ibn Malik heard Umar ibn al-Khattab return thegreeting of a man who greeted him. Then Umar asked the man, "How areyou?" He said, "I praise Allah to you." (Ahmadu ilayka Allah) Umarsaid, "That is what I wanted from you." (FR)
USC-MSA web (English) reference: Book 53, Hadith 5 (FR)
Arabic reference (FR): Book 53, Hadith 1763 (FR)