Mukhtasar Sahih Bukhari — Hadith 691

Lady Asma bint Abi Bakr Siddiq (may Allah be pleased with her) says that (on one occasion) the Messenger of Allah (peace and blessings be upon him) delivered a sermon, and he mentioned the trial of the grave by which a person will be tested. Upon hearing this, the Muslims cried out loudly and wept.