If it is the case that such a person records the type of materials mentioned above and guards the cassette recorder as well as tapes against being misused, it will be permissible. It may be even recommended (Part No. 12; Page No. 210) in case it helps one comprehend matters of religion and acquire beneficial knowledge because means are of the same ruling as objectives. This may not be banned because most cassette records are used for evil purposes, as long as you use it for good purposes.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.