Muslim bin Haja Neysaburi (Died 261 AH) narrated a lengthy narration about Umar's encounter with a female companion "Asma binte Umais ". In the narration following thing is written :
قَالَ فَدَخَلَتْ أَسْمَاءُ بِنْتُ عُمَيْسٍ - وَهِيَ مِمَّنْ قَدِمَ مَعَنَا - عَلَى حَفْصَةَ زَوْجِ النَّبِيِّ صلى الله عليه وسلم زَائِرَةً وَقَدْ كَانَتْ هَاجَرَتْ إِلَى النَّجَاشِيِّ فِيمَنْ هَاجَرَ إِلَيْهِ فَدَخَلَ عُمَرُ عَلَى حَفْصَةَ وَأَسْمَاءُ عِنْدَهَا فَقَالَ عُمَرُ حِينَ رَأَى أَسْمَاءَ مَنْ هَذِهِ قَالَتْ أَسْمَاءُ بِنْتُ عُمَيْسٍ . قَالَ عُمَرُ الْحَبَشِيَّةُ هَذِهِ الْبَحْرِيَّةُ هَذِهِ فَقَالَتْ أَسْمَاءُ نَعَمْ . فَقَالَ عُمَرُ سَبَقْنَاكُمْ بِالْهِجْرَةِ فَنَحْنُ أَحَقُّ بِرَسُولِ اللَّهِ صلى الله عليه وسلم مِنْكُمْ . فَغَضِبَتْ وَقَالَتْ كَلِمَةً كَذَبْتَ يَا عُمَرُ كَلاَّ وَاللَّهِ كُنْتُمْ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم يُطْعِمُ جَائِعَكُمْ وَيَعِظُ جَاهِلَكُمْ وَكُنَّا فِي دَارِ أَوْ فِي أَرْضِ الْبُعَدَاءِ الْبُغَضَاءِ فِي الْحَبَشَةِ وَذَلِكَ فِي اللَّهِ وَفِي رَسُولِهِ وَايْمُ اللَّهِ لاَ أَطْعَمُ طَعَامًا وَلاَ أَشْرَبُ شَرَابًا حَتَّى أَذْكُرَ مَا قُلْتَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم
Asma' bint 'Umais who had migrated to Abyssinia and had come back along with them (along with immigrants) visited Hafsa, the wife of Allah's Apostle (ﷺ). (Accordingly), Umar had been sitting with her (Hafsa). As 'Umar saw Asma, he said: Who is she? She (Hafsa) said: She is Asma, daughter of 'Umais. He said: She is an Abyssinian and a sea-woman. Asma said: Yes, it is so. Thereupon 'Umar said: We preceded you in migration and so we have more right to Allah's Messenger (ﷺ) as compared with you. At this she felt annoyed and said: 'Umar, No, You are lying. By Allah, you had the privilege of being in the company of the Messenger (ﷺ) who fed the hungry among you and instructed the ignorant amongst you, whereas we had been far (from here) in the land of Abyssinia amongst the enemies and that was all for Allah and Allah's Messenger (ﷺ) and, by Allah, I would never take food nor take water unless I make a mention to Allah's Messenger (ﷺ) of what you have said.
Sahih - Muslim bin Hajaj // Volume 7 // Page 363 - 364 // Number 2583 // Edn. Dar Al-Tasil Riyadh Saudi Arabia.
Now when same narration is quoted by Al-Bukhari and Abu Ya'ala Mosuli they erased out the part " كذبتَ يا عمر (You are lying Umar) to defend Umar.
Sahih - Bukhari // Volume 3 // 366 - 367 // Number 4230 // Edn. Risalah Al-Alamiyyah Beriut Lebanon.
Musnad - Abu Ya'la // Volume 13 // Page 303 - 304 // Number 96 // Edn. Maktaba Rushd Riyadh Saudi Arabia.