وَعَوْرَةُ الرَّجُلِ مَا بَيْنَ السُّرَّةِ وَمُنْتَهَى الرُّكْبَةِ
For a man, the Awrah is from below the navel through the knee. The navel itself is not included; the knee is included under the rule stated by the source.
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Male Awrah
Covering the Awrah in Prayer: Male and Female Boundaries
وَعَوْرَةُ الرَّجُلِ مَا بَيْنَ السُّرَّةِ وَمُنْتَهَى الرُّكْبَةِ
For a man, the Awrah is from below the navel through the knee. The navel itself is not included; the knee is included under the rule stated by the source.