Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "No Muslim regularly attends the mosques to perform prayer and remember Allah, but Allah is delighted for him just as the family of one who was away, is delighted upon his return."
A Muslim who regularly frequents mosques to perform prayers and remember Allah, Allah, the Almighty, rejoices for him, just as the family of someone who was away feels upon his return. Allah's rejoicing should not be interpreted as clemency or mercy, etc, rather, it should be affirmed as an attribute of Allah without distortion, negation, interpolation, or representation; although rejoicing is associated with mercy and compassion; and Allah knows best.