Frankincense was placed on the Inner Altar of the tabernacle and burned continuously. The Hebrew word for Frankincense is lebonah, which means incense or free burning It speaks of intercession.
Ps 141:2 “Let my prayer be set before You as incense, the lifting up of my hands as the evening sacrifice.”
The aroma of Frankincense cannot be fully released until it is subjected to fire. Prophetically this represents the consuming fire of God.