'Prayers of the Saints' in the Bible

And when He had taken the book, the four living beings and the twenty-four elders fell down in front of the Lamb [i.e., to worship Him]. Each one of them held [in his hands] a harp and a golden bowl full of incense, which are the prayers of the saints [See Psa. 141:2; Rev. 8:3-4].

And the smoke of the [burning] incense, [mingled] with the prayers of the saints, ascended from [the incense holder in] the angel's hand up to the presence of God.