I will have an intercourse with seventy wives during the night; all of them will give birth to a male child who will fight in the cause of Allah. His companion or the ang I said to him: Say," If God wills." But he (Hadrat Sulaimin) did not say so, and he forgot it. And none of his wives gave birth to a child, but one who gave birth to a premature child. Messenger of Allah ﷺ said: Had he said Insha' Allah (if God so will). he would not have failed and his desire would have been materialised.
عَنِ النَّبِيِّ ﷺ قَالَ قَالَ سُلَيْمَانُ بْنُ دَاوُدَ نَبِيُّ اللَّهِ لأَطُوفَنَّ اللَّيْلَةَ عَلَى سَبْعِينَ امْرَأَةً كُلُّهُنَّ تَأْتِي بِغُلاَمٍ يُقَاتِلُ فِي سَبِيلِ اللَّهِ فَقَالَ لَهُ صَاحِبُهُ أَوِ الْمَلَكُ قُلْ إِنْ شَاءَ اللَّهُ فَلَمْ يَقُلْ وَنَسِيَ فَلَمْ تَأْتِ وَاحِدَةٌ مِنْ نِسَائِهِ إِلاَّ وَاحِدَةٌ جَاءَتْ بِشِقِّ غُلاَمٍ فَقَالَ رَسُولُ اللَّهِ ﷺ وَلَوْ قَالَ إِنْ شَاءَ اللَّهُ لَمْ يَحْنَثْ وَكَانَ دَرَكًا لَهُ فِي حَاجَتِهِ