The Messenger of Allah ﷺ said, "A man entered Paradise though he had never done any good deed. When death came to him, he said to his family, 'When I die, burn me, then grind my remains to powder, then scatter half of me in the sea and half on the land.' So Allah commanded the land and the sea, and they gathered him together. Then Allah asked him, 'What made you do what you did?' He replied, 'Fear of You.' So Allah forgave him because of that."
حدثنا معاوية بن هشام حدثنا شيبان أبو معاوية حدثنا فراس بن يحيى الهمداني عن عطية العوفي
أن رسول الله ﷺ قال لقد دخل رجل الجنة ما عمل خيرا قط قال لأهله حين حضره الموت إذا أنا مت فأحرقوني ثم اسحقوني ثم اذروا نصفي في البحر ونصفي في البر فأمر الله البر والبحر فجمعاه ثم قال ما حملك على ما صنعت قال مخافتك قال فغفر له بذلك
Its isnad is hasan. Shayban is Ibn Abdul-Rahman Tamimi, who is trustworthy, and the rest of them are all subjects of some discussion, being truthful narrators with errors. The hadith is found in Bukhari 6/494, no. 3452 (Fath), and Muslim 4/2109, no. 2756, and it has already been mentioned previously.