I went to Messenger of Allah ﷺ along with a group of people from (the tribe of) Al-Ashʿari, asking for mounts. The Prophet ﷺ said, "By Allah, I will not give you anything to ride, and I have nothing to mount you on." We stayed there as long as Allah wished, and after that, some camels were brought to the Prophet and he ordered that we be given three camels. When we set out, some of us said to others, "Allah will not bless us, as we all went to Messenger of Allah ﷺ asking him for mounts, and although he had sworn that he would not give us mounts, he did give us." So we returned to the Prophet; and mentioned that to him. He said, "I have not provided you with mounts, but Allah has. By Allah, Allah willing, if I ever take an oath, and then see that another is better than the first, I make expiration for my (dissolved) oath, and do what is better and make expiration."  

أَتَيْتُ رَسُولَ اللَّهِ ﷺ فِي رَهْطٍ مِنَ الأَشْعَرِيِّينَ أَسْتَحْمِلُهُ فَقَالَ وَاللَّهِ لاَ أَحْمِلُكُمْ مَا عِنْدِي مَا أَحْمِلُكُمْ ثُمَّ لَبِثْنَا مَا شَاءَ اللَّهُ فَأُتِيَ بِإِبِلٍ فَأَمَرَ لَنَا بِثَلاَثَةِ ذَوْدٍ فَلَمَّا انْطَلَقْنَا قَالَ بَعْضُنَا لِبَعْضٍ لاَ يُبَارِكُ اللَّهُ لَنَا أَتَيْنَا رَسُولَ اللَّهِ ﷺ نَسْتَحْمِلُهُ فَحَلَفَ أَنْ لاَ يَحْمِلَنَا فَحَمَلَنَا فَقَالَ أَبُو مُوسَى فَأَتَيْنَا النَّبِيَّ ﷺ فَذَكَرْنَا ذَلِكَ لَهُ فَقَالَ مَا أَنَا حَمَلْتُكُمْ بَلِ اللَّهُ حَمَلَكُمْ إِنِّي وَاللَّهِ إِنْ شَاءَ اللَّهُ لاَ أَحْلِفُ عَلَى يَمِينٍ فَأَرَى غَيْرَهَا خَيْرًا مِنْهَا إِلاَّ كَفَّرْتُ عَنْ يَمِينِي وَأَتَيْتُ الَّذِي هُوَ خَيْرٌ وَكَفَّرْتُ  

the same narration above (i.e. 709), "I make expiation for my dissolved oath, and I do what is better, or do what is better and make expiation."  

وَقَالَ إِلاَّ كَفَّرْتُ يَمِينِي وَأَتَيْتُ الَّذِي هُوَ خَيْرٌ أَوْ أَتَيْتُ الَّذِي هُوَ خَيْرٌ وَكَفَّرْتُ  

(The Prophet) Solomon said, "Tonight I will sleep with (my) ninety wives, each of whom will get a male child who will fight for Allah's Cause." On that, his companion (Sufyan said that his companion was an angel) said to him, "Say, "If Allah will (Allah willing)." But Solomon forgot (to say it). He slept with all his wives, but none of the women gave birth to a child, except one who gave birth to a halfboy. Abu Huraira added: The Prophet ﷺ said, "If Solomon had said, "If Allah will" (Allah willing), he would not have been unsuccessful in his action, and would have attained what he had desired." Once Abu Huraira added: Allah apostle said, "If he had accepted."  

سُلَيْمَانُ لأَطُوفَنَّ اللَّيْلَةَ عَلَى تِسْعِينَ امْرَأَةً كُلٌّ تَلِدُ غُلاَمًا يُقَاتِلُ فِي سَبِيلِ اللَّهِ فَقَالَ لَهُ صَاحِبُهُ قَالَ سُفْيَانُ يَعْنِي الْمَلَكَ قُلْ إِنْ شَاءَ اللَّهُ فَنَسِيَ فَطَافَ بِهِنَّ فَلَمْ تَأْتِ امْرَأَةٌ مِنْهُنَّ بِوَلَدٍ إِلاَّ وَاحِدَةٌ بِشِقِّ غُلاَمٍ فَقَالَ أَبُو هُرَيْرَةَ يَرْوِيهِ قَالَ لَوْ قَالَ إِنْ شَاءَ اللَّهُ لَمْ يَحْنَثْ وَكَانَ دَرَكًا فِي حَاجَتِهِ وَقَالَ مَرَّةً قَالَ رَسُولُ اللَّهِ ﷺ لَوِ اسْتَثْنَى وَحَدَّثَنَا أَبُو الزِّنَادِ عَنِ الأَعْرَجِ مِثْلَ حَدِيثِ أَبِي هُرَيْرَةَ