Sahih al-Bukhari — Oneness, Uniqueness of Allah (Tawheed) — Hadith No: 7503
Translation
Narrated Zaid bin Khalid:It rained (because of the Prophet's invocation for rain) and the Prophet (ﷺ) said, "Allah said, 'Some of My slaves have become disbelievers in Me, and some others, believers in Me