Imam Ja‘far al-Ṣadiq (as): There are five types of prayer that are not veiled from Allah, Blessed and most High,: The prayer of a just leader, the prayer of a wronged person, in which case Allah says: 'I will surely take your revenge in due time.', the prayer of a righteous son for his parents, the prayer of a righteous father for his son, and the prayer of a believer for his brother in secret, in which case the angel says: 'And you will have its like.' al-Kāfī