Musannaf Ibn Abi Shaybah 28218 — A man saying to his brother: May

Talhah bin Ubaydullah bin Kariz said that Sayyiduna Umar (may Allah be pleased with him) said: If one of you knew what reward there is for him in saying these words to his brother, "May Allah give you the best reward," you would say them to one another far more often.