Narrated Zaid bin Arqam:
When 'Abdullah bin Ubai said, "Do not spend on those who are with Allah's Apostle," and also said, "If we return to Medina," I informed the Prophet of his saying. The Ansar blamed me for that, and 'Abdullah bin Ubai swore that he did not say. I returned to my house and slept. Allah's Apostle then called me and I went to him. He said, "Allah has confirmed your statement." The Verse: "They are the one who say: Spend nothing......(63.7) was revealed.
Sahih al-Bukhari, Vol. 6, Book of Prophetic Commentary on the Qur'an, Hadith 425
Sahih al-Bukhari, Book of Prophetic Commentary on the Qur'an, Hadith 425