An is a non-governing explanatory particle. Yā is vocative; Ibrāhīmu is a proper-name vocative built on ḍamma, accusative in syntactic position. No imperfect follows an here.
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Parsing An Yā Ibrāhīm
The Two Explanatory Particles: Ay and An
An is a non-governing explanatory particle. Yā is vocative; Ibrāhīmu is a proper-name vocative built on ḍamma, accusative in syntactic position. No imperfect follows an here.