Abdullah bin Ubayd bin Umayr said: I asked Sayyidah Aishah (may Allah be pleased with her) about sudden death: is it disliked? She said: "For what reason would it be disliked? I asked the Messenger of Allah (peace and blessings be upon him) about it, and he (peace and blessings be upon him) said: 'It is relief for the believer and a cause of grief for the wicked.'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6572