Surah Al-Baqarah, Verse 248

وَقَالَ لَهُمۡ نَبِيُّهُمۡ إِنَّ ءَايَةَ مُلۡكِهِۦٓ أَن يَأۡتِيَكُمُ ٱلتَّابُوتُ فِيهِ سَكِينَةٞ مِّن رَّبِّكُمۡ وَبَقِيَّةٞ مِّمَّا تَرَكَ ءَالُ مُوسَىٰ وَءَالُ هَٰرُونَ تَحۡمِلُهُ ٱلۡمَلَٰٓئِكَةُۚ إِنَّ فِي ذَٰلِكَ لَأٓيَةٗ لَّكُمۡ إِن كُنتُم مُّؤۡمِنِينَ٢٤٨

waqāla lahum nabiyyuhum inna āyata mul'kihi an yatiyakumu l-tābūtu fīhi sakīnatun min rabbikum wabaqiyyatun mimmā taraka ālu mūsā waālu hārūna taḥmiluhu l-malāikatu inna fī dhālika laāyatan lakum in kuntum mu'minīna

And their prophet said to them, "Indeed, a sign of his kingship is that the chest will come to you in which is assurance from your Lord and a remnant of what the family of Moses and the family of Aaron had left, carried by the angels. Indeed in that is a sign for you, if you are believers."