The expression “when you rise for prayer” refers to intending or preparing for prayer, not merely the literal act of standing up.
The commentary explains that someone who already has valid wudu is not required to renew it before every prayer. The command is interpreted together with other evidence.
It also notes that the practice of wudu was known before the Madinan revelation of this verse, despite prayer having begun earlier.
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What “Idha Qumtum” Means
Taharah and Wudu Obligations: Limits, Evidence and Juristic Differences
The expression “when you rise for prayer” refers to intending or preparing for prayer, not merely the literal act of standing up.
The commentary explains that someone who already has valid wudu is not required to renew it before every prayer. The command is interpreted together with other evidence.
It also notes that the practice of wudu was known before the Madinan revelation of this verse, despite prayer having begun earlier.