3654 - وَ كَتَبَ مُحَمَّدُ بْنُ عِيسَى بْنِ عُبَيْدٍ اَلْيَقْطِينِيُّ إِلَى أَبِي اَلْحَسَنِ عَلِيِّ بْنِ مُحَمَّدٍ اَلْعَسْكَرِيِّ عَلَيْهِ اَلسَّلاَمُ : فِي رَجُلٍ دَفَعَ اِبْنَهُ إِلَى رَجُلٍ وَ سَلَّمَهُ مِنْهُ سَنَةً بِأُجْرَةٍ مَعْلُومَةٍ لِيَخِيطَ لَهُ ثُمَّ جَاءَ رَجُلٌ آخَرُ فَقَالَ لَهُ سَلِّمْ اِبْنَكَ مِنِّي سَنَةً بِزِيَادَةٍ هَلْ لَهُ اَلْخِيَارُ فِي ذَلِكَ وَ هَلْ يَجُوزُ لَهُ أَنْ يَفْسَخَ مَا وَافَقَ عَلَيْهِ اَلْأَوَّلُ أَمْ لاَ فَكَتَبَ عَلَيْهِ اَلسَّلاَمُ بِخَطِّهِ "يَجِبُ عَلَيْهِ اَلْوَفَاءُ لِلْأَوَّلِ مَا لَمْ يَعْرِضْ لاِبْنِهِ مَرَضٌ أَوْ ضَعْفٌ".
Hadith.3654 - Muhammad bin Isa bin Ubaid Al-Yaqtini wrote to Abu Al-Hasan Imam Ali bin Muhammad Al-Askari 
, asking: "A man entrusted his son to another man and handed him over for a year with a known wage to sew for him. Then another man came and said to him, 'Hand over your son to me for a year with an increased wage.'
Does he have the choice in this matter, and is it permissible for him to revoke the agreement made with the first man or not?"
Imam replied in his handwriting: 'He must fulfill the agreement with the first man unless his son faces illness or weakness.'
