Al-Adab Al-Mufrad, Hadith 595 ⓘ
Anas said to his son, Thabit, "My son, exchange gifts, it will bring about love between you."
حَدَّثَنَا مُوسَى، قَالَ: حَدَّثَنَا سُلَيْمَانُ بْنُ الْمُغِيرَةِ، عَنْ ثَابِتٍ قَالَ: كَانَ أَنَسٌ يَقُولُ: يَا بَنِيَّ، تَبَاذَلُوا بَيْنَكُمْ، فَإِنَّهُ أَوَدُّ لِمَا بَيْنَكُمْ.
also referenced under: Book 30, Hadith 58 (In-Book) & Book 30, Hadith 595 (English)