AHMAD-ZUHD 224:
from Yaḥyá b. Abū Kathīr —
[Machine] "Solomon bin David, ﷺ , said to his son: 'My dear son, how ugly is sin with its dwelling, and how uglier is going astray after guidance, and how uglier is so and so, and uglier than that is a man who used to worship his Lord but abandoned the worship of his Lord.'"
الزهد لأحمد ٢٢٤:
عن يحيى بن ابو كثير —
قَالَ سُلَيْمَانُ بْنُ دَاوُدَ عَلَيْهِ السَّلَامُ لِابْنِهِ «أَيْ بُنَيَّ مَا أَقْبَحَ الْخَطِيئَةَ مَعَ الْمَسْكَنَةِ وَأَقْبَحَ الضَّلَالَةَ بَعْدَ الْهُدَى وَأَقْبَحَ كَذَا وَكَذَا وَأَقْبَحُ مِنْ ذَلِكَ رَجُلٌ كَانَ عَابِدًا فَتَرَكَ عِبَادَةَ رَبِّهِ»