Aya number 248 of surat Al-Baqara
بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ
وَقَالَ لَهُمْ نَبِيُّهُمْ إِنَّ آيَةَ مُلْكِهِ أَنْ يَأْتِيَكُمُ التَّابُوتُ فِيهِ سَكِينَةٌ مِنْ رَبِّكُمْ وَبَقِيَّةٌ مِمَّا تَرَكَ آلُ مُوسَىٰ وَآلُ هَارُونَ تَحْمِلُهُ الْمَلَائِكَةُ إِنَّ فِي ذَٰلِكَ لَآيَةً لَكُمْ إِنْ كُنْتُمْ مُؤْمِنِينَ [٢٤٨]
Translation: English - Sahih International
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."
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