Abu Sa'id told a woman coming to God’s messenger and saying, “Messenger of God, the men have a monopoly of what you say, so appoint us a day on which we may come to you to teach us some of what God has taught you.” He told them to gather on such and such a day in such and such a place, and when they did so he came to them and taught them some of what God had taught him. Then he said, “No woman among you will be predeceased by three of her children without that being a curtain from hell for her." One of the women asked whether that applied if there were two, repeating the question twice, and he replied, “Two also, two also, two also." Bukharl transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي سَعِيدٍ قَالَ: جَاءَتِ امْرَأَةٌ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَتْ: يَا رَسُولَ اللَّهِ ذَهَبَ الرِّجَالُ بِحَدِيثِكَ فَاجْعَلْ لَنَا مِنْ نَفْسِكَ يَوْمًا نَأْتِيكَ فِيهِ تُعَلِّمُنَا مِمَّا عَلَّمَكَ اللَّهُ. فَقَالَ: «اجْتَمِعْنَ فِي يَوْمِ كَذَا وَكَذَا فِي مَكَانِ كَذَا وَكَذَا» فَاجْتَمَعْنَ فَأَتَاهُنَّ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَعَلَّمَهُنَّ مِمَّا عَلَّمَهُ اللَّهُ ثُمَّ قَالَ: «مَا مِنْكُنَّ امْرَأَةٌ تُقَدِّمَ بَيْنَ يَدَيْهَا من وَلَدهَا ثَلَاثَة إِلَّا كَانَ لَهَا حِجَابا ن النَّارِ» فَقَالَتِ امْرَأَةٌ مِنْهُنَّ: يَا رَسُولَ اللَّهِ أَوِ اثْنَيْنِ؟ فَأَعَادَتْهَا مَرَّتَيْنِ. ثُمَّ قَالَ: «وَاثْنَيْنِ وَاثْنَيْنِ وَاثْنَيْنِ» . رَوَاهُ البُخَارِيّ
sunnah.com