It is narrated from Hazrat Abu Bakr Siddiq (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: No miser, no deceiver, no treacherous person, and no ill-mannered person will enter Paradise. And the first people to knock at the door of Paradise will be slaves, but by this is meant those slaves who prove to be good in their relationship with Allah and their masters, that is, they care about the rights of Allah and do not fall short in serving their masters in any way, and they fully fulfill their rights.