27 They perceived not that He was speaking to them of the Father.
John 8:27 Cross References - Worrell
John 8:43
43 Why do ye not understand My speech? it is because ye cannot hear My word.
John 8:47
47 He that is of God hears the words of God; on this account, ye hear them not, because ye are not of God."
Romans 11:7-10
7 What, then? What Israel is seeking for, this he did not obtain; but the election obtained it, and the rest were hardened;
8 as it has been written, "God gave them a spirit of stupor, eyes that they should not see, and ears that they should not hear, unto this day."
9 And David says, "Let their table be a snare, and a trap, and a stumbling-block, and a recompense to them:
10 let their eyes be darkened, that they may not see, and bow down their back always."