﴿ ذَٰلِكَ مِنْ أَنۢبَآءِ ٱلْغَيْبِ نُوحِيهِ إِلَيْكَ ۖ وَمَا كُنتَ لَدَيْهِمْ إِذْ أَجْمَعُوٓا۟ أَمْرَهُمْ وَهُمْ يَمْكُرُونَ ﴾

“THIS ACCOUNT of something that was beyond the reach of thy perception We [now] reveal unto thee, [O Prophet:] for thou wert not with Joseph's brothers when they resolved upon what they were going to do and wove their schemes [against him].”

Please check ayah 12:104 for complete tafsir.