Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "If a stone as heavy as seven pregnant she-camels, including the weight of their fat and their young, were thrown into Hell and kept falling for seventy years, even then it would not reach its bottom."
Abu Ya'la recorded it; its chain contains a narrator, Yazid bin Aban al-Raqashi, and he is da'if (weak), though he has been declared trustworthy; the remaining narrators of this narration are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب صفة أهل النار / 18587