Hadithcore
Al-Adab Al-Mufrad, 595
sahih· Al-Albani

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.‏

References2 variants
In-Book Reference
Book 30, Hadith 58
English Reference
Book 30, Hadith 595