Sayyiduna Abdullah bin Umar (may Allah be pleased with them) reports that the Messenger of Allah (peace and blessings be upon him) supplicated: O Allah! Have mercy on those who shave their heads! The companions (may Allah be pleased with them) submitted: And those who trim their hair, O Messenger of Allah? The Prophet (peace and blessings be upon him) again supplicated: O Allah! Have mercy on those who shave their heads! The companions (may Allah be pleased with them) again submitted: And those who trim their hair, O Messenger of Allah? Then the Prophet (peace and blessings be upon him) said: And those who trim their hair as well.