By Shaykh 'Abdul-'Azeez ar-Raajihee
The four sunan (Aboo Daawood, At-Tirmidhee, An-Nasaa’ee, and Ibn Majah), the musnad of Imaam Ahmad, and the sunan of Ad-Daarimee, all contain ahaadeeth that are saheeh (authentic), hasan (good), and da’eef (weak). For they did not make it a condition for their books to contain only the ahaadeeth that are saheeh as Al-Bukhaaree and Muslim did. Rather, their intent was to gather all the ahaadeeth as they relate to a particular matter. Similarly are those other such the musnad of At-Taylasee and the three ma’ajim of At-Tabaraanee. As for the muwatta of Imaam Maalik, it contains ahaadeeth that are saheeh, hasan, and da’eef.