In the ancient Jewish context, events that happen on earth are mirrored in heaven. There is a correspondence. So the burning of incense on the altar of incense in the tabernacle or temple is matched by the offering of incense in the heavenly temple of God’s throne room. John seems to be suggesting that the incense and prayers are intermingled, and as with sacrifices, the incense gives the prayers a sweet aroma that is pleasing to God.
