﴿ قِيلَ لَهَا ٱدْخُلِى ٱلصَّرْحَ ۖ فَلَمَّا رَأَتْهُ حَسِبَتْهُ لُجَّةًۭ وَكَشَفَتْ عَن سَاقَيْهَا ۚ قَالَ إِنَّهُۥ صَرْحٌۭ مُّمَرَّدٌۭ مِّن قَوَارِيرَ ۗ قَالَتْ رَبِّ إِنِّى ظَلَمْتُ نَفْسِى وَأَسْلَمْتُ مَعَ سُلَيْمَٰنَ لِلَّهِ رَبِّ ٱلْعَٰلَمِينَ ﴾

“[After a while] she was told: “Enter this court!” - but when she saw it, she thought that it was a fathomless expanse of water, and she bared her legs. Said he: “Behold, it is [but] a court smoothly paved with glass!” Cried she: “O my Sustainer! I have been sinning against myself thy worshipping aught but Thee]: but [now] I have surrendered myself, with Solomon, unto the Sustainer of all the worlds!””

Please check ayah 27:47 for complete tafsir.