﴿ وَجَآءَتْ سَيَّارَةٌۭ فَأَرْسَلُوا۟ وَارِدَهُمْ فَأَدْلَىٰ دَلْوَهُۥ ۖ قَالَ يَٰبُشْرَىٰ هَٰذَا غُلَٰمٌۭ ۚ وَأَسَرُّوهُ بِضَٰعَةًۭ ۚ وَٱللَّهُ عَلِيمٌۢ بِمَا يَعْمَلُونَ ﴾

“AND THERE CAME a caravan; and they sent forth their drawer of water, and he let down his bucket into the well - [and when he saw Joseph] he exclaimed: "Oh, what a lucky find, this boy!" And they hid him with a view to selling him: but God had full knowledge of all that they were doing.”

Please check ayah 12:20 for complete tafsir.