The Messenger of Allah ﷺ said, "When the last of this nation curses the first of it, whoever conceals a hadith has concealed what Allah has revealed."
حدثنا الحسين بن أبي السري العسقلاني حدثنا خلف بن تميم عن عبد الله بن السري عن محمد بن المنكدر
قال رسول الله ﷺ إذا لعن آخر هذه الأمة أولها فمن كتم حديثا فقد كتم ما أنزل الله
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[Fabricated]. Ibn Adi and others narrated it through various chains from Khalaf, from him.Abdullah bin Sari never met Muhammad bin Munkadir. Rather, he heard this hadith from Saeed bin Zakariya Madaini, from Anbasah bin Abdul-Rahman (a discarded narrator whom Abu Hatim accused of fabrication), from Muhammad bin Zazan (a discarded narrator), from Ibn Munkadir, from him, as it appears in Mujam al-Awsat by Tabarani, hadith no. 432.