Al-Tawḥīd

2. Muhammad ibn al-Hasan ibn Ahmed ibn al-Walid (ra) said: Muhammad ibn al-Husan al-Saffar said: Ibrahim ibn Hashim said on the authority of al-Husayn ibn Yazid al-Nawfili on the authority of Isma’il ibn Muslim al-Sakuni from Abu `Abdullah Ja’far ibn Muhammad (a.s.), on the authority of his father (a.s.), on the authority of his forefathers, peace be upon them, that The Messenger of Allah (sw) said: “The best act of worship [`ibadah] is to say: `There is no god but Allah’.”