Poor sahaba giving few dates as charity in Tabuk Expedition

An online video was talking about the virtue of charity, adding that for Allah what matters is not quantity but sincerity, and the percentage one gave away from he owns. And told the story of a sahaba who worked the whole day just to earn a few dates, and gave as charity during Tabuk Expedition. And some mocked him. But the Prophet (peace and blessings be upon him) said that Allah accepted the charity (in the sense that, as I understand, Allah liked it more than others' charity because the man gave almost everything he had). The speaker also added that this incident is, perhaps indirectly, mentioned in an ayah. Is there a reliable hadith with respect to this incident?