Skandapurana 1.2.25.16

1.2.25.16

15 atha viṣṇukṛtastutyā prasannena śaṃkareṇa tejaḥstaṃbhaṃ vinirbhidya saguṇapañcavadanamūrtiprakaṭanam, taṃ saguṇarūpaṃ parameśvaraṃ śrīśaṃkaraṃ dṛṣṭvā viṣṇorānandaḥ,tathā ca brahmaṇo lajjāprāptiḥ, maheśvareṇa brahmaṇe'pūjyatārūpaśāpapradānam, ketakacchadasya ca svapūjānarhatārūpaśāpapradānam, atha brahmadevakṛtaśivastutyudyamaḥ 247

15. Next, Śaṃkara, pleased by the praise offered by Viṣṇu, splits open the pillar of fire and reveals his five-faced form endowed with attributes; Viṣṇu's joy upon seeing that supreme lord, glorious Śaṃkara, in his form with attributes, and likewise Brahmā's experiencing shame; the bestowal of a curse of unworthiness of worship upon Brahmā by Maheśvara, and the bestowal of a curse upon the ketakī leaf of being unfit for his worship; then, Brahmā's preparation to offer praise to Śiva 247