Those documents were likely portions of the Hebrew Scriptures that Paul used in his in - depth study.
(‏ عب ٥ :‏ ​ ١٢ -‏ ١٤‏ )‏ رَنَّمَ صَاحِبُ ٱلْمَزْمُورِ مُعَبِّرًا عَنِ ٱلْقِيمَةِ ٱلثَّمِينَةِ لِكَلِمَةِ ٱللهِ :‏ « شَرِيعَةُ فَمِكَ خَيْرٌ لِي مِنْ أُلُوفِ ذَهَبٍ وَفِضَّةٍ .‏