Al-Witr (ie: the night prayer) at the end of the night is afḍa | Al-Jadwal
Al-Witr (ie: the night prayer) at the end of the night is afḍal (ie: better), But whoever prays al-Witr at the beginning of the night, that is fine. It is permissible to pray after Witr but one should not repeat Witr.
مَسْأَلَةٌ: وَالْوِتْرُ آخِرُ اللَّيْلِ أَفْضَلُ. وَمَنْ أَوْتَرَ أَوَّلَهُ فَحَسَنٌ، وَالصَّلَاةُ بَعْدَ الْوِتْرِ جَائِزَةٌ، وَلَا يُعِيدُ وِتْرًا آخَرَ؛
Ibn Ḥazm, al-Muḥallá bi ʾl-Āthār 2/91 #291
ابن حزم، المحلى بالآثار ٢/٩١ #٢٩١
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