The Peak of Eloquence · Hadith 1331 (#Passage #140)

فَإِنِّي أُوصِيكَ بِتَقْوَى اللهِ أَيْ بُنَيَّ، وَلُزُومِ أَمْرِهِ، وَعِمَارَةِ قَلْبِكَ بِذِكْرِهِ، وَالِاعْتِصَامِ بِحَبْلِهِ، وَأَيُّ سَبَبٍ أَوْثَقُ مِنْ سَبَبٍ بَيْنَكَ وَبَيْنَ اللهِ إِنْ أَنْتَ أَخَذْتَ بِهِ.

I advise you to fear Allāh, O my child, abide by His commands, fill your heart with remembrance of Him and cling to hope from Him. No connection is more reliable than the connection between you and Allāh provided you take hold of it.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).