See hadith 4909  

أَتَجْعَلُونَ عَلَيْهَا التَّغْلِيظَ وَلاَ تَجْعَلُونَ عَلَيْهَا الرُّخْصَةَ لَنَزَلَتْ سُورَةُ النِّسَاءِ الْقُصْرَى بَعْدَ الطُّولَى {وَأُولاَتُ الأَحْمَالِ أَجَلُهُنَّ أَنْ يَضَعْنَ حَمْلَهُنَّ}  

"I was sitting with some people in Al-Kufah in a large gathering of the Ansar, among whom was 'Abdur-Rahman bin Abi Laila. They spoke about the story of Subai'ah and I mentioned what 'Abdullah bin 'Utbah bin Mas'ud had said in meaning." (One of the narrators) Ibn 'Awn's saying was: "when she gives birth." Ibn Abi Layla said: 'But his (paternal) uncle did not say that.' I raised my voice and said: 'Would I dare to tell lies about 'Abdullah bin 'Utbah when he is in the vicinity of Al-Kufah?'" He said: "Then I met Malik and said: 'What did Ibn Mas'ud say about the story of Subai'ah?' He said: 'He said: "Are you going to be too strict with her and not allow her the concession (with regard to the 'Iddah)? The shorter Surah about women (At-Talaq) was revealed after the longer one (Al-Baqarah)."'"  

أَتَجْعَلُونَ عَلَيْهَا التَّغْلِيظَ وَلاَ تَجْعَلُونَ لَهَا الرُّخْصَةَ لأُنْزِلَتْ سُورَةُ النِّسَاءِ الْقُصْرَى بَعْدَ الطُّولَى  

"I was sitting with some people in Al-Kufah in a large gathering of the Ansar, among whom was 'Abdur-Rahman bin Abi Laila. They spoke about the story of Subai'ah and I mentioned what 'Abdullah bin 'Utbah bin Mas'ud had said in meaning." (One of the narrators) Ibn 'Awn's saying was: "when she gives birth." Ibn Abi Layla said: 'But his (paternal) uncle did not say that.' I raised my voice and said: 'Would I dare to tell lies about 'Abdullah bin 'Utbah when he is in the vicinity of Al-Kufah?'" He said: "Then I met Malik and said: 'What did Ibn Mas'ud say about the story of Subai'ah?' He said: 'He said: "Are you going to be too strict with her and not allow her the concession (with regard to the 'Iddah)? The shorter Surah about women (At-Talaq) was revealed after the longer one (Al-Baqarah)."'" (Using translation from Nasāʾī 3521)  

قَالَ «أَتَجْعَلُونَ عَلَيْهَا التَّغْلِيظَ وَلَا تَجْعَلُونَ لَهَا الرُّخْصَةَ لَأُنْزِلَتْ سُورَةُ النِّسَاءِ الْقُصْرَى بَعْدَ الطُّولَى»