ذَلِكَ لِيَعْلَمَ أَنِّي لَمْ أَخُنْهُ بِالْغَيْبِ وَأَنَّ اللّهَ لاَ يَهْدِي كَيْدَ الْخَائِنِينَ
[12:52]
This is that he might know that I have not been unfaithful to him in secret and that Allah does not guide the device of the unfaithful.
"This (say I), in order that He may know that I have never been false to him in his absence, and that Allah will never guide the snare of the false ones.
(Then Joseph said: I asked for) this, that he (my lord) may know that I betrayed him not in secret, and that surely Allah guideth not the snare of the betrayers.