Yajtahidu is an imperfect verb, Form VIII, from j-h-d (ijtahada–yajtahidu), meaning to exert effort.
Fī al-duʿāʾ is a prepositional phrase specifying the field of effort: earnest supplication.
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Morphology of yajtahidu
Book of Hajj: Standing at Arafat, Dhuhr and Asr, and Departure for Muzdalifah
Yajtahidu is an imperfect verb, Form VIII, from j-h-d (ijtahada–yajtahidu), meaning to exert effort.
Fī al-duʿāʾ is a prepositional phrase specifying the field of effort: earnest supplication.