Dhamma-tthiti-ñāna: 'knowledge of the fixity of law, is a name for that 'insight which is leading up' to the entrance into one of the 4 supra-mundane paths vutthāna-gāminī-vipassanā. In the Susima Sutta see: XII, 70 this ascending insight is called the 'knowledge of the fixity of the law', namely:;At first, Susima, there exists the knowledge of the fixity of the law, and later the knowledge of Nibbāna.; See Vis.M XXI.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.