Yusuf had His Golden Bowl placed in Binyamin's Bag; a Plot to keep Him in Egypt
After Yusuf supplied them with their provisions, he ordered some of his servants to place his silver bowl (in Binyamin's bag), according to the majority of scholars. Some scholars said that the king's bowl was made from gold. Ibn Zayd added that the king used it to drink from, and later, measured food grains with it since food became scarce in that time, according to Ibn `Abbas, Mujahid, Qatadah, Ad-Dahhak and `Abdur-Rahman bin Zayd. Shu`bah said that Abu Bishr narrated that Sa`id bin Jubayr said that Ibn `Abbas said that the king's bowl was made from silver and he used it to drink with. Yusuf had the bowl placed in Binyamin's bag while they were unaware, and then had someone herald,
أَيَّتُهَا الْعِيرُ إِنَّكُمْ لَسَارِقُونَ
(O you (in) the caravan! Surely, you are thieves!) They looked at the man who was heralding this statement and asked him,
مَّاذَا تَفْقِدُونَقَالُواْ نَفْقِدُ صُوَاعَ الْمَلِكِ
("What is it that you have lost" They said: "We have lost the bowl of the king..."), which he used to measure food grains,
وَلِمَن جَآءَ بِهِ حِمْلُ بَعِيرٍ
(and for him who produces it is a camel load), as a reward,
وَأَنَاْ بِهِ زَعِيمٌ
(and I will be bound by it.), as assurance of delivery of the reward.
Ma'arif al-Qur'an
Mufti Muhammad Shafi
Verse 71 carries the response of the accused: قَالُوا وَأَقْبَلُوا عَلَيْهِم مَّاذَا تَفْقِدُونَ that is, ` the brothers of Yusuf turned to the announcer, as if protesting on being made into thieves, and asked him to say what is it that you seem to have lost.'
The ancient capital of Egypt was a city around which there was a rampart with many gates in it. Jacob’s advice to his sons that they should not enter the city through the same gate, but through different gates was based on the fear that some enemy of theirs might try to kill them (Tafsir an-Nasafi). Verse 73 of this chapter clarifies the matter of this fear. In this Joseph’s brothers profess that they are innocent by saying that they had not come there to fight or steal. Joseph’s brothers had come to Egypt from foreign lands; their way of dressing was different from that of the local people; because of their appearance they would appear to be outsiders to the people of Egypt; the entry of eleven such persons together would have created suspicion in the eyes of the people. So in order to save them from any unnecessary clash with the local people, Jacob advised them not to band together in one group while entering the city. A believer’s eyes are ever on the supreme power of God; he observes that in this universe nobody has any power except God. At the same time he knows that this world is a testing ground. Owing to the exigencies of this test God has hidden all matters behind the veil of cause and effect. For this reason, Jacob advised his sons to take worldly precautions. But he also said that whatever happened, would happen at the instance of God, because nobody except God had any real power.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.