Ibn al-Mubarak reported: Awn ibn Abdullah, may Allah be pleased with him, said, “A man advised his son, saying: O my son, you must be mindful of Allah. If you are able to be better today than you were yesterday, and to be better tomorrow than you are today, then do so.”
Source: al-Zuhd wal-Raqā’iq 832
عن بن المبارك قَالَ عَوْنُ بْنُ عَبْدِ اللَّهِ رضي الله عنه قَالَ أَوْصَى رَجُلٌ ابْنَهُ فَقَالَ يَا بُنَيَّ عَلَيْكَ بِتَقْوَى اللَّهِ وَإِنِ اسْتَطَعْتَ أَنْ تَكُونَ الْيَوْمَ خَيْرًا مِنْكَ أَمْسِ وَغَدًا خَيْرًا مِنْكَ الْيَوْمَ فَافْعَلْ
832 الزهد والرقائق لابن المبارك
