Al-Baqara · 2:248

Their prophet said to them, ‘The sign of his authority will be that the Ark [of the Covenant] will come to you. In it there will be [the gift of] tranquillity from your Lord and relics of the followers of Moses and Aaron, carried by the angels. There is a sign in this for you if you believe.’

Word-by-word analysis is only wired up for the demo verses (1:1 and 1:2) for now.