You are reading a tafsir for the group of verses 12:84 to 12:87
وتولى عنهم وقال يا اسفى على يوسف وابيضت عيناه من الحزن فهو كظيم ٨٤ قالوا تالله تفتا تذكر يوسف حتى تكون حرضا او تكون من الهالكين ٨٥ قال انما اشكو بثي وحزني الى الله واعلم من الله ما لا تعلمون ٨٦ يا بني اذهبوا فتحسسوا من يوسف واخيه ولا تياسوا من روح الله انه لا يياس من روح الله الا القوم الكافرون ٨٧
وَتَوَلَّىٰ عَنْهُمْ وَقَالَ يَـٰٓأَسَفَىٰ عَلَىٰ يُوسُفَ وَٱبْيَضَّتْ عَيْنَاهُ مِنَ ٱلْحُزْنِ فَهُوَ كَظِيمٌۭ ٨٤ قَالُوا۟ تَٱللَّهِ تَفْتَؤُا۟ تَذْكُرُ يُوسُفَ حَتَّىٰ تَكُونَ حَرَضًا أَوْ تَكُونَ مِنَ ٱلْهَـٰلِكِينَ ٨٥ قَالَ إِنَّمَآ أَشْكُوا۟ بَثِّى وَحُزْنِىٓ إِلَى ٱللَّهِ وَأَعْلَمُ مِنَ ٱللَّهِ مَا لَا تَعْلَمُونَ ٨٦ يَـٰبَنِىَّ ٱذْهَبُوا۟ فَتَحَسَّسُوا۟ مِن يُوسُفَ وَأَخِيهِ وَلَا تَا۟يْـَٔسُوا۟ مِن رَّوْحِ ٱللَّهِ ۖ إِنَّهُۥ لَا يَا۟يْـَٔسُ مِن رَّوْحِ ٱللَّهِ إِلَّا ٱلْقَوْمُ ٱلْكَـٰفِرُونَ ٨٧
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3

Jacob was heartbroken on losing his two very dear sons. But at the same time he pinned his hopes on the Grace of God. He was certain that Joseph’s dream predicted the future and that it would definitely come true. That is why he asked his sons to go and search for Joseph and also to try to have Benjamin released.