The verse intensifies the idea of shaking through both the verb and its verbal noun, presenting a forceful, dreadful upheaval.
56:4
QURANHIVE
When the earth is shaken in a violent shaking
إِذَا رُجَّتِ الْأَرْضُ رَجًّا
“When the earth is shaken in a (violent) shaking”.
The word gathers meanings around shaking, instability, and weakness, showing a movement from firmness into collapse.
The earth is depicted as shaken until it no longer serves its original purpose and is rendered weak.
Phrase-level reading
The wording itself conveys force, certainty, and magnitude
رُجَّتِ
From the verb رَجَّ — a forceful shaking.
رَجًّا
A verbal noun following the verb to affirm the action; the tanween instills magnitude, dread, or terror.
Ibn ‘Ashour: the masdar رَجًّا comes after رُجَّتِ to reinforce the event itself, while its tanween gives the expression a heightened sense of enormity and fear.
The root world of رَجَّ
A semantic field built from examples in usage
A wide family of images from the same root shows that the word carries more than motion alone.
These three meanings form the central field of the root.
Interpretive synthesis
Putting the root meanings together
“When the earth is shaken to a point where it no longer serves its original purpose and is rendered weak.”
- The earth is not merely moving; it is being transformed from stable usefulness into breakdown.
- The coming verses show a broader trend: things once strong become weak, and things once stable become unstable.
Lexical imagery
Examples that illustrate what this root can suggest
Mixed water and mud
رِجْرَجَة is used for the remains of water in a basin or tank mixed with clay or mud, suggesting disturbed, unsettled instability.
A wobbly hump
A camel is described as رَجَّاءُ when its hump is shaky or wobbly, reinforcing the sense of unstable motion.
Swaying movement
الرَّجْراجَةُ is used to describe a woman whose posterior wobbles, sways, or moves back and forth.
Violence of the sea
اِرْتَجَّ describes the sea when its waves are unstable or violent.
A violently shaken wall or door
If someone رَجَّ a door or wall, he caused it to shake violently.
Struggle under sheer multitude
An army battalion is described as رَجْراجَةُ when it struggles in its march and barely moves because of its multitude.
Repeated back-and-forth motion
تَرَجْرَجَ is used of a thing that keeps going back and forth.
Softened and weakened
The root also carries a meaning of softness and weakness; الرِّجرِجُ refers to saliva and also to bread soaked and mixed in broth until soft.
Emaciation and frailty
A نَعْجَةٌ (ewe) is described as رَجَاجَةٌ when it is emaciated, weak, and skinny.
Weakness among people
رِجْرَجَة among النَّاس refers to people with no good in them and no minds, extending the root to human weakness and worthlessness.
Syntactic note
A relation between two “when” clauses
Al-Alousiy comments that إِذَا رُجَّتِ stands as the predicate for the subject إِذَا وَقَعَتِ, and that neither is functioning as a conditional here.
Meaning conveyed
They carry the sense of “a time”: the time of its occurrence is the time of the earth’s violent shaking — the time when the Waaqi‘ah happens is the time when the earth will shake violently.
Descriptive image from Al-Qurtubi
How the shaking was described by the mufassiroon
The earth will shake like an infant shakes in the crib when unsettled and unhappy, until everything upon it collapses, and everything upon it — mountains and otherwise — breaks apart.
Conceptual flow of the ayah
From firmness to fragility
1
Stable earth
The earth begins as a place of settled function and dependable stability.
2
Violent shaking
The wording intensifies the motion through both verb and masdar, making the shaking emphatic and dreadful.
3
Loss of original purpose
The gathered root meanings point to a state where the earth is no longer fit for its prior role and is rendered weak.
Key transition
Strong becomes weak. Stable becomes unstable. This is a clear trend in the coming ayaat.
Educational takeaway
The ayah’s power is not only in imagery, but in morphology, syntax, and root semantics working together.
Scholarly notes represented together
Three angles to consider
Ibn ‘Ashour
The masdar after the verb is for affirmation, and the tanween on it communicates magnitude, dread, or terror.
Al-Alousiy
إِذَا رُجَّتِ functions as the predicate for إِذَا وَقَعَتِ; both signify the timing of the event rather than conditionality.
Al-Qurtubi
The mufassiroon described the earth shaking like an infant in a crib when unsettled, until what is on it collapses and breaks apart, including mountains and all else.