Sayyiduna Anas (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Since Allah Almighty created the son of Adam, he has never faced anything harder for him than death." The Prophet (peace and blessings be upon him) said: "Yet death is easier compared with what comes after it."
Ahmad recorded it, and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجنائز / 3893
Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) says: The last hardship (that is, difficult or severe thing) that the believer faces is death.
Ahmad recorded it. Its chain contains Qabus; Yahya bin Ma'in and Ibn Adi declared him thiqah (trustworthy), while al-Nasa'i (may Allah have mercy on him) and others called him da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجنائز / 3894
Sayyidah Sawdah (may Allah be pleased with her), the wife of the Prophet (peace and blessings be upon him), narrates: I said: "O Messenger of Allah! When we die, will Uthman bin Maz'un pray for mercy for us until he comes to us?" The Prophet (peace and blessings be upon him) said to Sayyidah Sawdah (may Allah be pleased with her): "O daughter of Zam'ah! If you knew what I know about death, you would realise that it is harder than what you estimate."
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجنائز / 3895