“He [Allah] is the One Who showers His blessings upon you [O Prophet].”
Part of the same revealed passage as Surah al-Ahzab 33:37 (the Qur'anic marriage of the Prophet ﷺ to Zaynab bint Jahsh RA); the lecture on this event quotes 33:43 directly as part of the "page and a half" of praise for the Prophet ﷺ that follows 33:37 in the same sequence.