The Statement of Allah taala: That is because they believed, then disbelieved, therefore their hearts are sealed, so they understand not. (V.63:3)

When `Abdullah bin Ubai said, "Do not spend on those who are with Allah's Messenger (ﷺ)," and also said, "If we return to Medina," I informed the Prophet (ﷺ) 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 Messenger (ﷺ) 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.