"I said: 'O Messenger of Allah, how can I pay back the dues of the one who breast-fed me?' He said: 'By giving a male or female slave.'" (Using translation from Nasāʾī 3329)
سَأَلْتُ رَسُولَ اللهِ ﷺ مَا يُذْهِبُ عَنِّي مَذَمَّةَ الرَّضَاعِ؟ قَالَ «غُرَّةٌ عَبْدٌ أَوْ أَمَةٌ»