Al-Kahf 70
قَالَ فَإِنِ ٱتَّبَعْتَنِى فَلَا تَسْـَٔلْنِى عَن شَىْءٍ حَتَّىٰٓ أُحْدِثَ لَكَ مِنْهُ ذِكْرًا ﴿٧٠﴾
Qala faini ittabaAAtanee fala tasalnee AAan shayin hatta ohditha laka minhu thikran
He (Khidr) said: "Then, if you follow me, ask me not about anything till I myself mention it to you." The Noble Quran