It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever remembers Allah and his eyes overflow with tears out of the fear of Allah, so much that his tears reach the ground, Allah Almighty will not punish him on the Day of Resurrection."
Hadith Referenceالمعجم الأوسط / باب الألف / 1641
Hadith Takhrij«أخرجه الحاكم فى «المستدرك» برقم: 7763، والطبراني فى «الأوسط» برقم: 6171»