Never was the Prophet ﷺ asked for a thing to be given for which his answer was 'no'.  

سَمِعْتُ جَابِرًا ؓ يَقُولُ مَا سُئِلَ النَّبِيُّ ﷺ عَنْ شَىْءٍ قَطُّ فَقَالَ لاَ  

Once the Prophet ﷺ said (to me), "If the money of Bahrain comes, I will give you a certain amount of it." The Prophet ﷺ had breathed his last before the money of Bahrain arrived. When the money of Bahrain reached, Abu Bakr announced, "Whoever was promised by the Prophet ﷺ should come to us." I went to Abu Bakr and said, "The Prophet ﷺ promised me so and so." Abu Bakr gave me a handful of coins and when I counted them, they were five-hundred in number. Abu Bakr then said, "Take twice the amount you have taken (besides).  

قَالَ النَّبِيُّ ﷺ لَوْ قَدْ جَاءَ مَالُ الْبَحْرَيْنِ قَدْ أَعْطَيْتُكَ هَكَذَا وَهَكَذَا وَهَكَذَا فَلَمْ يَجِئْ مَالُ الْبَحْرَيْنِ حَتَّى قُبِضَ النَّبِيُّ ﷺ فَلَمَّا جَاءَ مَالُ الْبَحْرَيْنِ أَمَرَ أَبُو بَكْرٍ فَنَادَى مَنْ كَانَ لَهُ عِنْدَ النَّبِيِّ ﷺ عِدَةٌ أَوْ دَيْنٌ فَلْيَأْتِنَا فَأَتَيْتُهُ فَقُلْتُ إِنَّ النَّبِيَّ ﷺ قَالَ لِي كَذَا وَكَذَا فَحَثَى لِي حَثْيَةً فَعَدَدْتُهَا فَإِذَا هِيَ خَمْسُمِائَةٍ وَقَالَ خُذْ مِثْلَيْهَا