Helping others fulfill their oaths

It was narrated from Mujahid, that 'Abdur-Rahman bin Safwan, or Safwan bin 'Abdur- Rahman Al-Qurashi said:
"On the Day of the conquest of Makkah, he came with his father and he said: 'O Messenger of Allah, give my father a share of Hijrah.' He said: 'There is no Hijrah.' Then he went away and entered upon 'Abbas and said: 'Do you know who I am?' He said: 'Yes.' Then 'Abbas went out, wearing a shirt and no upper wrap, and said: 'O Messenger of Allah, do you know so-and-so with whom we have friendly ties? He brought his father to swear an oath of allegiance (i.e., promise) to emigrate.' The Prophet ﷺ said: 'There is no Hijrah.'" 'Abbas said: 'I adjure you to do it.' The Prophet ﷺ stretched forth his hand and touched his hand, and said: 'I have fulfilled the oath of my uncle, but there is no Hijrah."' (Da'if)Another chain with similar wording. Yazid bin Abu Ziyad said: "Meaning: There is no Hijrah from a land whose people have accepted Islam."

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ، عَنْ يَزِيدَ بْنِ أَبِي زِيَادٍ، عَنْ مُجَاهِدٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ صَفْوَانَ، أَوْ عَنْ صَفْوَانَ بْنِ عَبْدِ الرَّحْمَنِ الْقُرَشِيِّ، قَالَ لَمَّا كَانَ يَوْمُ فَتْحِ مَكَّةَ جَاءَ بِأَبِيهِ فَقَالَ يَا رَسُولَ اللَّهِ اجْعَلْ لأَبِي نَصِيبًا فِي الْهِجْرَةِ . فَقَالَ " إِنَّهُ لاَ هِجْرَةَ " . فَانْطَلَقَ فَدَخَلَ عَلَى الْعَبَّاسِ فَقَالَ قَدْ عَرَفْتَنِي فَقَالَ أَجَلْ . فَخَرَجَ الْعَبَّاسُ فِي قَمِيصٍ لَيْسَ عَلَيْهِ رِدَاءٌ فَقَالَ يَا رَسُولَ اللَّهِ قَدْ عَرَفْتَ فُلاَنًا وَالَّذِي بَيْنَنَا وَبَيْنَهُ جَاءَ بِأَبِيهِ لِيُبَايِعَكَ عَلَى الْهِجْرَةِ . فَقَالَ النَّبِيُّ ﷺ " إِنَّهُ لاَ هِجْرَةَ " . فَقَالَ الْعَبَّاسُ أَقْسَمْتُ عَلَيْكَ . فَمَدَّ النَّبِيُّ ﷺ يَدَهُ فَمَسَّ يَدَهُ فَقَالَ " أَبْرَرْتُ عَمِّي وَلاَ هِجْرَةَ " .