How sound is the attribution of the aforementioned saying to Abdullah ibn Rawaha, and does it indicate the prevalence of three divorces with a single pronouncement in one sitting during the time of the Prophet, may Allah bless him and grant him peace?

This story, narrated by Ibn Abi Al-Dunya concerning the martyrdom of Abdullah ibn Rawaha in Mu'tah, where it is said that he threw a camel rib he was eating, then fought after his finger was injured, and began to recite: "Are you but a finger that bled," then divorced his wife, freed his slaves, and gave his garden in charity – its chain of narration is not authentic due to discontinuities and the obscurity of some of its narrators, such as Al-Hakam ibn Abd al-Salam, Abd al-Quddus ibn Abd al-Wahid, and Ibn Abi Al-Dunya's father.