Bede : But also those who came from the captivity, the sons of the exile, etc. A great devotion and religiosity is shown by those who, when they came from captivity, arriving at the temple and altar of the Lord, first of all offered burnt offerings, not only for themselves but also for all Israel, that is, both for those who had already returned home and for those who were still enduring exile from their homeland, so that the mercy of their creator might protect them all. The spiritual meaning is also evident, that those who truly and perfectly escaped the captivity of the ancient enemy, by sinning they were held, but by repenting they freed themselves, who with firm intention submit to divine service, who wholly detach themselves from low desires, and are inflamed by the flame of heavenly desire to ascend to the heights. This is to offer burnt offerings, that is, wholly burned sacrifices or victims to the Lord, thinking or doing nothing but His will in all things. It is also a sign of a perfect mind when someone sacrifices for all Israel, that is, for the general well-being of all the faithful, as if mindful of unity and brotherhood in all, he supplicates the heavenly piety. — Commentary on Ezra and Nehemiah