Surah Al-Baqarah (The Cow), Verse 248

وَقَالَ لَهُمْ نَبِیُّهُمْ اِنَّ اٰیَةَ مُلْكِهٖۤ اَنْ یَّاْتِیَكُمُ التَّابُوْتُ فِیْهِ سَكِیْنَةٌ مِّنْ رَّبِّكُمْ وَبَقِیَّةٌ مِّمَّا تَرَكَ اٰلُ مُوْسٰی وَاٰلُ هٰرُوْنَ تَحْمِلُهُ الْمَلٰٓىِٕكَةُ اِنَّ فِیْ ذٰلِكَ لَاٰیَةً لَّكُمْ اِنْ كُنْتُمْ مُّؤْمِنِیْنَ 

Wa qaala lahum Nabiyyuhum inna Aayata mulkiheee ai yaatiyakumut Taabootu feehi sakeenatummir Rabbikum wa baqiyyatummimmaa taraka Aalu Moosa wa Aalu Haaroona tahmiluhul malaaa'ikah; inna fee zaalika la Aayatal lakum in kuntum mu'mineen

“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."”

Quran 2:248 (Yusuf Ali Translation)