What is the context of revelation for this āyah?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. The first opinion is that when the Prophet (ﷺ) commanded preparation for the journey to Makkah, some Bedouins said: "O Messenger of Allah! With what shall we prepare? By Allah, we have no provisions or wealth!" Then this verse was revealed. [Ibn ʿAbbās]
2. The second opinion is that the Anṣār used to spend and give charity, but they were struck by a year of hardship, so they withheld their spending; thereupon, this verse was revealed. [Al-Ḍaḥḥāk b. Abī Jubayrah]