Joel 2:31 describes the sun and moon turning dark and blood-colored just before “the great and terrible day of the LORD.” It is a vivid picture of a moment when God’s judgment and presence become unmistakable, and the verse is best read as part of a larger promise about God’s Spirit and salvation. The prophet Joel speaks these words in the name of the LORD to the people of Judah, calling them to hear what God is about to do in their history and in the age to come.
The sun will be turned into darkness, and the moon into blood, before the great and terrible day of the LORD comes.
Joel 2:31 (WEB)
What Joel 2:31 Means
The verse uses cosmic imagery. When it says the sun will be “turned into darkness” and the moon “into blood,” it is describing the sky itself disturbed, as if the lights that mark the rhythm of days and seasons have failed. In the Hebrew prophetic tradition, such imagery signals that something has gone seriously wrong in the created order, and that God is stepping in with decisive action. The language is symbolic and poetic, meant to convey awe and urgency rather than to give a timetable.
The phrase “the great and terrible day of the LORD” refers to a time when God acts in judgment and deliverance. The word “terrible” here means awe-inspiring and weighty, the kind of day that makes people tremble before the holiness of God. It does not mean random cruelty. The verse does not promise that every reader will escape hardship, nor does it give a date. What it does affirm is that God’s purposes will reach their climax, and that the coming day belongs to the LORD.
The Context of Joel 2:31
The book of Joel is short and tightly structured. Scholars generally date it to the post-exilic period, though the exact date is debated, and it is traditionally attributed to the prophet Joel, about whom little else is known. The book begins with a devastating locust plague and drought that strip the land bare, and Joel uses the crisis to call the people to repentance and to lament before God. The audience is the people of Judah and Jerusalem, gathered to fast and cry out.
Verse 31 sits in the middle of a promise that God will pour out his Spirit on all people, with sons, daughters, old men, young men, and even servants receiving the gift of prophecy and vision. The signs of darkness and blood appear right before the day of the LORD and then immediately before verse 32, which says that whoever calls on the LORD’s name will be saved. Read in this light, the frightening signs in the sky are not the last word. They frame a moment of judgment that ends in deliverance for those who turn to God.
Key Phrases in Joel 2:31
Acts 2:20
The sun will be turned into darkness, and the moon into blood, before the great and glorious day of the Lord comes.
(WEB)
Peter quotes this passage from Joel on the day of Pentecost, applying the signs of darkness and blood to the events of his own time. Reading Acts 2:20 alongside Joel 2:31 shows how the early church understood the prophecy as fulfilled in part with the coming of the Spirit, while still looking toward the final day of the LORD.
Revelation 6:12
I saw when he opened the sixth seal, and there was a great earthquake. The sun became black as sackcloth made of hair, and the whole moon became as blood.
(WEB)
In John’s vision of the opening of the sixth seal, the sun becomes black and the moon becomes like blood, echoing Joel’s imagery. This connection helps readers see how later biblical writers drew on the same prophetic language to describe God’s decisive intervention in history and the coming of his kingdom.
A Short Prayer From Joel 2:31
Lord, when the world feels uncertain and the signs around me seem troubling, help me to remember that you are sovereign over every day, including the great and terrible day of your coming. Give me a heart that trusts you more than the appearance of things. Teach me to call on your name, to rest in your salvation, and to live with hope that is anchored in your faithfulness. Keep my eyes fixed on you, and let my fear be turned into trust. Amen.
