Hakeem bin Hizam reported,
On the day of Badr we heard a sound falling from the sky to the earth, like the sound of a pebble dropping into a basin. The Messenger of Allah ﷺ threw those pebbles at them, and they were routed. This is what Allah Most High meant by His words, "And you did not throw when you threw, but it was Allah who threw, so that He might test the believers with a good trial from Him" [Anfal 8:17].
Azami 12365
Hasanعن حكيم بن حزام قال
لما كان يوم بدر سمعنا صوتا وقع من السماء إلى الأرض، كأنه صوت حصاة وقعت في طست، ورمى رسول الله ﷺ بتلك الحصيات، فانهزموا، فذلك قول الله تعالى: {وما رميت إذ رميت ولكن الله رمى وليبلي المؤمنين منه بلاء حسنا}.
Tabarani reported it in al-Kabir (3/227), Tabari in his Tafsir (11/84), Ibn Abu Hatim in al-Tafsir (5/1672), and Bayhaqi in al-Dalail (3/80), all of them through routes from Musa bin Yaqub Zami, from Yazid bin Abdullah, from Abu Bakr bin Sulayman bin Abu Huthama, from Hakeem bin Hizam, who related it. The wording given here is that of Ibn Abu Hatim.Haythami said in al-Majmu (6/84), "Its isnad is hasan." I say, Musa bin Yaqub Zami is hasan al-hadith. The chain also contains Yazid bin Abdullah, about whom Bayhaqi said, "This is Ibn Wahb bin Zama, the paternal uncle of Musa bin Yaqub." No one has declared him reliable except that Ibn Hibban mentioned him among the trustworthy narrators in his book. His nephew Musa bin Yaqub narrated from him, and his hadith has a basis, being related to the accounts of the military campaigns, a subject in which some leniency is shown that would not be shown in matters of legal rulings.Tabarani also reported it in al-Kabir (3/227) from Ahmad bin Ma Bahram Aydaji, who said, Muhammad bin Yazid Asfati told us, who said, Ibrahim bin Yahya Shajari told me, who said, my father told me, who said, Musa bin Yaqub Zami told us, from Abdullah bin Yazid, the freed slave of Aswad bin Sufyan, from Abu Bakr bin Sulayman bin Abu Huthama, from Hakeem bin Hizam, who said, "On the day of Badr, the Messenger of Allah ﷺ ordered, and he took a handful of pebbles, faced us with it, and threw it at us, saying, 'May the faces be disfigured.' So we were routed." Then Allah 
revealed, "You did not throw it, but it was Allah who threw it" [Anfal 8:17].This is how it appears in this isnad, "Abdullah bin Yazid, the freed slave of Aswad bin Sufyan," even though more than one narrator reported it from Musa Zami and named his source as "Yazid bin Abdullah," as in the previous isnad. In fact, Ibn Abu Hatim (5/1672) reported it through the route of Yahya bin Muhammad bin Hani, from Musa Zami, with the same wording, and named him "Yazid bin Abdullah," in agreement with the report of the group. So it seems more likely that what appears in Tabarani's Mujam is an error, for its isnad contains several defects.As for His saying, "You did not throw it, but it was Allah who threw it", it means, you did not make it reach its target when you threw it, but Allah made it reach its target, so it struck the faces of the disbelievers' army, and there was not one of them left who was not struck by some part of it.