Skandapurana 5.245.298

5.245.298

mantrayantrasamopetā brahmaviṣṇuśivādiṣu ..
nityarūpā mahārūpā sarvarūpā nirañjanā .. 298 ..

You are endowed with mantras and yantras in Brahmā, Viṣṇu, Śiva, and others; / eternal-formed, vast-formed, all-formed, taintless;