لَا يَجُوزُ الصَّلَاةُ عِنْدَ طُلُوعِ الشَّمْسِ،
Translation: Prayer is not permitted at the time the sun rises.
Sunrise here is the interval in which the solar disc is appearing and has not risen sufficiently. The ban is stronger than the broader dislike of voluntary prayers after Fajr.
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Prohibited and Disliked Times for Prayer: Rules and Differences
لَا يَجُوزُ الصَّلَاةُ عِنْدَ طُلُوعِ الشَّمْسِ،
Translation: Prayer is not permitted at the time the sun rises.
Sunrise here is the interval in which the solar disc is appearing and has not risen sufficiently. The ban is stronger than the broader dislike of voluntary prayers after Fajr.