The client of Usamah ibn Zayd said that he went along with Usamah to Wadi al-Qura in pursuit of his camels. He would fast on Monday and Thursday. His client said to him: Why do you fast on Monday and Thursday, while you are an old man? He said: The Prophet of Allah ﷺ used to fast on Monday and Thursday. When he was asked about it, he said: The works of the servants (of Allah) are presented (to Allah) on Monday and Thursday.  

أَنَّهُ انْطَلَقَ مَعَ أُسَامَةَ إِلَى وَادِي الْقُرَى فِي طَلَبِ مَالٍ لَهُ فَكَانَ يَصُومُ يَوْمَ الاِثْنَيْنِ وَيَوْمَ الْخَمِيسِ فَقَالَ لَهُ مَوْلاَهُ لِمَ تَصُومُ يَوْمَ الاِثْنَيْنِ وَيَوْمَ الْخَمِيسِ وَأَنْتَ شَيْخٌ كَبِيرٌ فَقَالَ إِنَّ نَبِيَّ اللَّهِ ﷺ كَانَ يَصُومُ يَوْمَ الاِثْنَيْنِ وَيَوْمَ الْخَمِيسِ وَسُئِلَ عَنْ ذَلِكَ فَقَالَ إِنَّ أَعْمَالَ الْعِبَادِ تُعْرَضُ يَوْمَ الاِثْنَيْنِ وَيَوْمَ الْخَمِيسِ  

[Machine] He said, "Usama used to ride to his wealth in the Valley of Al-Qura. He used to fast on Mondays and Thursdays while on the journey. So, I said to him, 'Why do you fast on Mondays and Thursdays while traveling, considering your old age and the weakness or softness of your body?' He replied, 'Verily, the Messenger of Allah ﷺ used to fast on Mondays and Thursdays, and he said, 'Verily, the deeds are presented [to Allah] on Mondays and Thursdays."'  

قَالَ كَانَ أُسَامَةُ يَرْكَبُ إِلَى مَالٍ لَهُ بِوَادِي الْقُرَى فَيَصُومُ الِاثْنَيْنِ وَالْخَمِيسَ فِي الطَّرِيقِ فَقُلْتُ لَهُ لِمَ تَصُومُ الِاثْنَيْنِ وَالْخَمِيسَ فِي السَّفَرِ وَقَدْ كَبِرْتَ وَضَعُفْتَ أَوْ رَقِقْتَ ؟ فَقَالَ إِنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَصُومُ الِاثْنَيْنِ وَالْخَمِيسَ وَقَالَ «إِنَّ أَعْمَالَ النَّاسِ تُعْرَضُ يَوْمَ الِاثْنَيْنِ وَالْخَمِيسِ»