Musannaf Ibn Abi Shayba 27:717

Muhammad ibn Bishr narrated to us, he said: Muhammad ibn ‘Amr narrated to us, he said: Sa‘d ibn al-Mundhir narrated to us, from Hamzah ibn Abi Usayd al-Ansari, from al-Harith ibn Ziyad, one of the companions of Badr, he said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever loves the Ansar, Allah will love him when he meets Him. And whoever hates the Ansar, Allah will hate him when he meets Him."