 Some are more general, like the "muṣannaf", the "muʿjam", and the "jāmiʿ", and some more specific, either characterized by the topics treated, like the "sunan" (restricted to legal-liturgical traditions), or by its composition, like the "arbaʿīniyyāt" (collections of forty hadiths).Shi'a Muslims seldom if ever use the six major hadith collections followed by the Sunni, as they do not trust many of the Sunni narrators and transmitters.They have their own extensive hadith literature.