Al-Kāfi
Hadith 164مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ خَالِدٍ عَنْ سَعْدِ بْنِ سَعْدٍ الْأَشْعَرِيِّ عَنْ أَبِي الْحَسَنِ الرِّضَا ( عليه السلام ) قَالَ سَأَلْتُهُ عَنِ الصَّبِيِّ هَلْ يُرْضَعُ أَكْثَرَ مِنْ سَنَتَيْنِ فَقَالَ عَامَيْنِ قُلْتُ فَإِنْ زَادَ عَلَى سَنَتَيْنِ هَلْ عَلَى أَبَوَيْهِ مِنْ ذَلِكَ شَيْءٌ قَالَ لَا .
8. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn Khalid from Sa‘d ibn Sa‘d al-Ash‘ariy who has said the following: “I once asked al-Rida’ (a.s.), about the case of a child; if he can be breastfed for more than two years. He (the Imam) said, ‘It is two years.’ I then asked, ‘If the child is breastfed for more than two years do parents owe anything?’ He (the Imam) said, ‘No, they do not owe anything.