Muhammad bin Yahya says that he asked Ubaidullah bin Abdullah to tell him from whom Abdullah bin Umar (may Allah be pleased with him) narrates that he considers ablution necessary for every prayer, whether a person is already in a state of ablution or not. Abdullah informed that Asma bint Zaid narrated this hadith to him from Abdullah bin Hanzalah (may Allah be pleased with him) that the Prophet Muhammad (peace be upon him) used to command ablution for every prayer, whether a person was already in a state of ablution or not. When this matter became difficult for the Prophet (peace be upon him), he commanded only the use of the miswak at the time of every prayer and ended the command for ablution, except if a person was not in a state of ablution. Since Abdullah bin Umar (may Allah be pleased with him) found himself able to perform ablution at the time of every prayer, he continued to act upon this until his death.