Virtues of the Muhajirin, Ansar and Those Who followed Them in Faith
Allah mentions that He is pleased foremost with the Muhajirin, Ansar and those who followed them in faith, and that they are well-pleased with Him, for He has prepared for them the gardens of delight and eternal joy. Ash-Sha`bi said that,
وَالسَّـبِقُونَ الاٌّوَّلُونَ مِنَ الْمُهَـجِرِينَ وَالأَنْصَـرِ
(The foremost Muhajirin and Ansar) are those who conducted the pledge of Ar-Ridwan in the year of Hudaybiyyah. Abu Musa Al-Ash`ari, Sa`id bin Al-Musayyib, Muhammad bin Sirin, Al-Hasan and Qatadah said that they are those who performed the prayer towards the two Qiblahs with the Messenger of Allah ﷺ first toward Jerusalem and later toward the Ka`bah. Allah, the Most Great, stated that He is pleased foremost with the Muhajirin, the Ansar and those who followed their lead with excellence. Therefore, woe to those who dislike or curse them, or dislike or curse any of them, especially their master after the Messenger ﷺ, the best and most righteous among them, the Siddiq (the great truthful one) and the grand Khalifah, Abu Bakr bin Abi Quhafah, may Allah be pleased with him. The failure group, the Rafidah (a sect of Shiites), are the enemies of the best Companions, they hate and curse them, we seek refuge with Allah from such evil. This indicates that the minds of these people are twisted and their hearts turned upside down, for where are they in relation to believing in the Qur'an They curse those whom Allah stated He is pleased with! As for the followers of the Sunnah, they are pleased with those whom Allah is pleased with, curse whomever Allah and His Messenger curse, and give their loyalty to Allah's friends and show enmity to the enemies of Allah. They are followers not innovators, imitating the Sunnah they do not initiate it on their own. They are indeed the party of Allah, the successful, and Allah's faithful servants.
Tafsir Ibn Kathir (abridged, English).