Al-Baqarah - 2:248

وَقَالَ لَهُمْ نِبِيُّهُمْ إِنَّ آيَةَ مُلْكِهِ أَن يَأْتِيَكُمُ التَّابُوتُ فِيهِ سَكِينَةٌ مِّن رَّبِّكُمْ وَبَقِيَّةٌ مِّمَّا تَرَكَ آلُ مُوسَى وَآلُ هَارُونَ تَحْمِلُهُ الْمَلآئِكَةُ إِنَّ فِي ذَلِكَ لآيَةً لَّكُمْ إِن كُنتُم مُّؤْمِنِينَ
[2:248]
And the prophet said to them: Surely the sign of His kingdom is, that there shall come to you the chest in which there is tranquillity from your Lord and residue of the relics of what the children of Musa and the children of Haroun have left, the angels bearing it; most surely there is a sign in this for those who believe.
And (further) their Prophet said to them: "A Sign of his authority is that there shall come to you the Ark of the covenant, with (an assurance) therein of security from your Lord, and the relics left by the family of Moses and the family of Aaron, carried by angels. In this is a symbol for you if ye indeed have faith."
And their Prophet said unto them: Lo! the token of his kingdom is that there shall come unto you the ark wherein is peace of reassurance from your Lord, and a remnant of that which the house of Moses and the house of Aaron left behind, the angels bearing it. Lo! herein shall be a token for you if (in truth) ye are believers.