It is narrated from Sayyiduna Abdullah bin Anis Juhani, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, said: Associating partners with Allah, disobedience to parents, and false oaths are among the gravest sins. Whoever swears a false oath in the name of Allah and introduces even as much falsehood as the wing of a mosquito into it, Allah Almighty will mark that evil as a spot upon his heart until the Day of Resurrection.