Shatapatha Brahmana 11.5.1.11

11.5.1.11

sā hovāca saṃvatsaratamīṃ rātrimāgacatāttanma ekāṃ rātrimante śayitāse jāta u te'yaṃ tarhi putro bhaviteti sa ha saṃvatsaratamīṃ rātrimājagāmeddhiraṇyavimitāni tato hainamekamūcuretatprapadyasveti taddhāsmai tāmupaprajidhyuḥ

She said, 'Come here the last night of the year from now: then shalt thou lie with me for one night, and then this son of thine will have been born.' He came there on the last night of the year, and lo, there stood a golden palace! They then said to him only this (word), 'Enter!' and then they bade her go to him.