It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said on the occasion of the burial of Sa'd bin Mu'adh (may Allah be pleased with him): "This is the righteous servant for whom the Throne of the Most Merciful moved, for whom the gates of heaven were opened; he was dealt with severely (in the grave), then Allah removed that constriction from him."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5321