Surah Al-Baqarah, verse 248

وَقَالَ لَهُمْ نَبِيُّهُمْ إِنَّ ءَايَةَ مُلْكِهِۦٓ أَن يَأْتِيَكُمُ ٱلتَّابُوتُ فِيهِ سَكِينَةٌ مِّن رَّبِّكُمْ وَبَقِيَّةٌ مِّمَّا تَرَكَ ءَالُ مُوسَىٰ وَءَالُ هَـٰرُونَ تَحْمِلُهُ ٱلْمَلَـٰٓئِكَةُ ۚ إِنَّ فِى ذَٰلِكَ لَـَٔايَةً لَّكُمْ إِن كُنتُم مُّؤْمِنِينَ ﴿٢٤٨﴾

2:248 Their prophet further said to them: “The sign of his kingship is that the Ark will come to you – carried by the angels – having therein tranquility from your Lord and remains of what the House of Moses and the House of Aaron had left. Indeed, there is a sign in this for you, if you are true believers.”