What Is a True Fast?
Isaiah 58 & the Sermon on the Mount — A 15-Minute Lesson
Isaiah 58 (NIV) in Dialogue with Matthew 5–7 (NIV)
By PS-Church
| 0:00–1:30 | HOOK: The Problem with Religious Performance |
| 1:30–4:00 | SECTION 1: The God Who Confronts Empty Fasting (Isa 58:1–5) |
| 4:00–8:00 | SECTION 2: The Fast God Actually Chose (Isa 58:6–7) — The Heart |
| 8:00–11:00 | SECTION 3: The Promises & the Sabbath (Isa 58:8–14) |
| 11:00–13:30 | SECTION 4: Matthew 5–7 — Jesus Fulfills Isaiah's Vision |
| 13:30–15:00 | APPLICATION & CLOSING: What Does Your Fasting Look Like? |
Ask the Room:
SETUP: In Isaiah 58, God confronts a people who are doing everything right — fasting, seeking God, humbling themselves — and He says: "I'm not listening." This is the question Isaiah 58 is answering: What does God actually want from us when we fast?
Key Verses:
Two Key Word Studies:
Not accidental sin — deliberate covenant-breaking. God knows their fasting is not innocent mistake.
Bows with every wind but has no moral backbone. God's scalding image of their "humility."
Isaiah 58:1–5 teaches:
- The people's religion was real but disconnected — genuine practice, empty of transformation.
- They fasted AND exploited workers on the same day (v.3b). Religion and injustice coexisted.
- Their "humility" was reed-humility — bending before God on fast days, snapping back to exploitation the next morning.
Matthew Connection:
Isaiah 58:6–7 — The Most Important Verses in the Chapter
vv.6–7
Is not this the kind of fasting I have chosen: to loose the chains of injustice and untie the cords of the yoke, to set the oppressed free and break every yoke? Is it not to share your food with the hungry and to provide the poor wanderer with shelter — when you see the naked, to clothe them, and not to turn away from your own flesh and blood?
Word Studies — The Anatomy of True Fasting:
Prisoner's chains. True fasting = liberation of the captive. The fast you do to free yourself should produce freedom for others.
Heavy wooden yoke of slavery and economic oppression. Yoke-breaking is true fasting.
Same word Jesus quotes from Isa 61:1 in Luke 4:18 — his mission statement. Jesus is the ultimate faster.
Not surplus — your bread. God demands sacrifice, not charity from excess. True fasting is costly.
THE BIG IDEA:
True fasting is not primarily about what you withhold from yourself — it is about what you release to others. The hunger you feel in fasting is meant to produce solidarity with those who are involuntarily hungry.
The Fast Consists of 6 Actions:
- Loose the chains of injustice
- Break every yoke of oppression
- Share your food with the hungry
- Provide shelter to the homeless poor
- Clothe the naked
- Do not turn away from family/community
Matthew 5–7 Connection:
The Promises of True Fasting (vv.8–12):
God's own word back to the faithful. Abraham says it to God (Gen 22). Isaiah says it to God (Isa 6:8). Now God says it to the just community.
Edenic imagery — the community that does justice becomes a restored Eden, a life-giving oasis.
The highest honor: the community whose justice practice rebuilds the social fabric of a shattered society.
The Sabbath Capstone (vv.13–14):
The Sabbath is not reluctant obligation — it is deep, sensory delight in God. The same word root as Eden's pleasures.
POINT: The Sabbath holds all true fasting together. You cannot sustain liberation, feeding, clothing, and justice without a Sabbath rhythm — a regular stopping of self-directed activity to rest in God.
The Sermon on the Mount as Isaiah 58 Fulfilled
KEY CONNECTION: Jesus doesn't just teach Isaiah 58 — He fulfills it. He is the yoke-breaker (Matt 11:28), the bread-sharer (John 6), the one who clothes the naked with His righteousness. The cross itself is the ultimate fast: total self-emptying for the liberation of others.
Three Diagnostic Questions from Isaiah 58:
1. Performance Check (v.2–5): Are you performing religion or being transformed by it? Is your spiritual practice producing justice, mercy, and humility — or just comfort and self-improvement?
2. The Neighbor Test (v.6–7): Does your fasting/praying produce action toward the hungry, the oppressed, the homeless, the vulnerable? Or does it stay entirely internal?
3. The Hineni Response (v.9a): God says "Here I am" to those who practice justice. If God feels distant, Isaiah 58 suggests asking: Who is the person I have been turning away from?
Closing Challenge:
This week, choose one element of Isaiah 58:6–7 and do it as an act of fasting:
- Fast a meal and give the money to a local food pantry
- Identify someone in your community who carries a heavy yoke — and help break it
- Remove a "pointing finger" — restore a broken relationship
- Practice Sabbath oneg — stop your own business one morning and simply delight in God
Pleasant Springs Church — Discipleship School
“Your light will break forth like the dawn.” — Isaiah 58:8
“You are the light of the world.” — Matthew 5:14
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