﴿ فَلَمَّآ أَن جَآءَ ٱلْبَشِيرُ أَلْقَىٰهُ عَلَىٰ وَجْهِهِۦ فَٱرْتَدَّ بَصِيرًۭا ۖ قَالَ أَلَمْ أَقُل لَّكُمْ إِنِّىٓ أَعْلَمُ مِنَ ٱللَّهِ مَا لَا تَعْلَمُونَ ﴾

“But when the bearer of good tidings came [with Joseph's tunic], he laid it over his face; and he regained his sight, [and] exclaimed: "Did I not tell you, `Verily, I know, from God, something that you do not know'?"”

Please check ayah 12:98 for complete tafsir.