These two verses [9:128-129] end Sūra al-Tawba, about which the Prophet (S) is reported to have said, “All the Qur’ān was sent to me verse by verse, word by word, except Sūra Barā’atu (that is, Sūra al-Tawba) and Say, ‘He, God, is One’ (that is, Sūrat al-Ikhlāṣ), which were sent down to me accompanied, each one of them, by seventy thousand rows of angels.”

     And in a ḥadīth reported in the Sunan of Abū Dāwūd and in Ibn Sunnī’s ʿAmal al-yawm wa-l-Layla, the Prophet (S) is reported to have said, “He who says in the morning and in the evening, ‘Allāh suffices me, there is no god except Him, upon Him do I depend, and He is the Lord of the Mighty Throne,’ seven times, God will suffice in whatever worries him, be he truthful or lying (in saying it).

     According to Ubayy ibn Kaʿb and others, these two verses [9:128-129] were the last of the Quran to be revealed.  

    As for the meaning, according to many tafsirs of the Quran, ḥasbiy Allāh means, “Allah will suffice in all that matters that concern me, be they about accomplishing good or being protected from evil.”