dhamma-ṭṭhiti-ñāṇa: 'knowledge of the fixity of law, is a name for that 'insight which is leading up' to the entrance into one of the 4 supermundane paths (vuṭṭhāna-gāminī-vipassanā, q.v.). In the Susima Sutta (S. 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.).

Buddhist Dictionary, Manual of Buddhist Terms and Doctrines, by NYANATILOKA MAHATHERA