Al-Matalib al-'Aliyah 2956 — Divine decree

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When divine decree (its subtleties and secrets) is mentioned, restrain yourselves (from debate and investigation); and when my Companions are mentioned (that is, when the matter of their mutual differences comes up), refrain (from criticism and disparagement)."
Takhrij and grading: Imam Abu Ya'la recorded this hadith in his Musnad; its chain contains a narrator named Dawud bin al-Muhabbar, who is da'if (weak), though on the basis of other routes and supporting reports the meaning of this hadith is sound and reliable.