The word(s) "knowest" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) And when Allah will say: O Isa son of Marium! did you say to men, Take me and my mother for two gods besides Allah he will say: Glory be to Thee, it did not befit me that I should say what I had no right to (say); if I had said it, Thou wouldst indeed have known it; Thou knowest what is in my mind, and I do not know what is in Thy mind, surely Thou art the great Knower of the unseen things.

(2) O our Lord! Surely Thou knowest what we hide and what we make public, and nothing in the earth nor any thing in heaven is hidden from Allah: