عن عَمْرُو بْنُ عَامِرٍ عَنْ أَنَس بن مالك قَالَ: كَانَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَتَوَضَّأُ عِنْدَ كُلِّ صَلَاةٍ، قُلْتُ: كَيْفَ كُنْتُمْ تَصْنَعُونَ؟ قَالَ: يُجْزِئُ أَحَدَنَا الْوُضُوءُ مَا لَمْ يُحْدِثْ.
The Prophet (may Allah's peace and blessings be upon him) used to perform ablution for every obligatory prayer, even if his ablution was not broken. This is to attain the reward and merit. It is permissible to perform more than one obligatory prayer with one ablution, so long as the ablution remains valid.
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