Shiva Purana

siva.sh/siva-purana/rudra-samhita/178/20

मायायेत्थं तु कवचं तस्माज्जग्राह वै हरिः ।। शङ्खचूडस्य रूपेण जगाम तुलसीं प्रति ।। 2.5.40.२० ।।

sanskrit

Viṣṇu thus snatched off his armour by means of deception. Then in the guise of Śaṅkhacūḍa Viṣṇu approached Tulasī.

english translation

mAyAyetthaM tu kavacaM tasmAjjagrAha vai hariH || zaGkhacUDasya rUpeNa jagAma tulasIM prati || 2.5.40.20 ||

hk transliteration by Sanscript