The answer is: A seraphim

Isaiah 6:6-7 - A seraphim, one of the heavenly beings in Isaiah's vision, touched Isaiah’s lips with a burning coal from the altar, symbolizing the purification of his sins and his readiness to deliver God’s message.

In Isaiah's dramatic vision, the seraphim play a pivotal role in turning the prophet into a messenger worthy of God's call. This coal represents more than just a physical cleansing; it's a powerful symbol of transformation. The act of touching Isaiah’s lips with a fiery coal makes us ponder how divine encounters often involve a ‘purge by fire,’ echoing imagery seen throughout various scripture tales where fire signifies both judgment and purification.

Isn’t it fascinating that seraphim, typically interpreted as fiery beings, embody not just fervor but also a redemptive energy? The word “seraphim” itself derives from a root that means ‘to burn,’ suggesting that to approach the divine, one must undergo this both stark and profound experience.

Moreover, consider how coal was often used in ancient religious rituals to symbolize offerings. In many cultures, including within the Biblical narratives, fire has been tied to communication with the divine—it’s there in Moses’ burning bush and when God's presence descends as smoke upon Mount Sinai. Here’s the kicker: just as Isaiah is purified, he’s also assigned the daunting task of carrying God's word to others, underscoring that a divine mandating often comes hand-in-hand with covenantal accountability. How aligned with every transformative story in our lives does this resonate? The invitation to be made new and take up one’s vocation after a pivotal moment of understanding remains timeless.