Translation of the verse 18 from Surah An-Nazi‘at : Number of verses 46 - - page 584 - Part 30.
And say to him: "Would you purify yourself (from the sin of disbelief by becoming a believer)",
And say to him, 'Would you [be willing to] purify yourself
(79:18) and say to him: 'Are you willing to be purified,
*7) According to general opinion among the commentators "the sacred . valley of 'Tuwa" means "the sacred valley which was named Tuwa". But, besides this, two other meanings of it also have been given: (1) "The valley that was blessed and made sacred twice" . for it was first made sacred when Allah spoke to Moses in it for the first time, and it was blessed and made sacred for the second time when the Prophet Moses led the children of Israel out of Egypt and brought them into it; and (2) "called out to him in the sacred valley in the night," and this is according to the meaning of tuwa in the Arabic idiom.
Source : An-Nazi‘at Verse 18: And say to him, 'Would you [be willing to] purify yourself