Abdullah bin Umar (may Allah be pleased with them both) said: Sa'd bin Ubadah (may Allah be pleased with him) fell ill, and the Messenger of Allah (peace and blessings be upon him) came to visit him, and Abd al-Rahman bin Awf (may Allah be pleased with him) was with him (peace and blessings be upon him), as were Sa'd bin Abi Waqqas and Abdullah bin Mas'ud (may Allah be pleased with them both). When he (peace and blessings be upon him) came to him, he was in a faint, and he (peace and blessings be upon him) said: "Has he died?" It was said: No. Then the Messenger of Allah (peace and blessings be upon him) wept. When the people saw him (peace and blessings be upon him) weeping, they wept too, and he (peace and blessings be upon him) said: "Do you not hear? Allah Almighty does not punish for the tears of the eye nor for the grief of the heart; rather, punishment comes because of this," and he (peace and blessings be upon him) pointed to his tongue, "or mercy is shown."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 7152