It is narrated from Sayyiduna Amr bin Abasah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Whoever builds a mosque for Allah so that Allah’s name will be mentioned therein, Allah will build a house for him in Paradise. And whoever frees a Muslim slave, it will be a ransom for him from Hell. And whoever grows old in the way of Allah, that old age will be a light for him on the Day of Resurrection.