‘Uthman ibn Za’idah reported: Luqman, may Allah be pleased with him, said to his son, “O my son, do not delay repentance, for death can come to you suddenly.”
Source: Shu’ab al-Imān 6701
عَنْ عُثْمَانَ بْنِ زَائِدَةَ قَالَ قَالَ لُقْمَانُ رضي الله عنه لابْنِهِ يَا بُنَيَّ لا تُؤَخِّرِ التَّوْبَةَ فَإِنَّ الْمَوْتَ قَدْ يَأْتِي بَغْتَةً
6701 شعب الإيمان للبيهقي