The Messenger of Allah ﷺ said, "The sign of faith is love for the Ansar, and the sign of hypocrisy is hatred toward them."
حدثنا محمد بن جعفر حدثنا شعبة عن عبد الله بن عبد الله بن جبر قال سمعت
قال رسول الله ﷺ آية الإيمان حب الأنصار وآية النفاق بغضهم
Its isnad is sahih. Bukhari related the hadith 1/62 no. 17 in Fath, in the Book of Faith, chapter on the signs of faith, Tirmidhi 5/712 no. 3900 in the Book of Virtues, chapter on the virtue of the Ansar, and Ibn Majah 1/57 no. 163 in the Introduction, chapter on the virtue of the Ansar.