Isaiah 58:8 - Coke's Commentary on the Holy Bible

Then shall thy light, &c.— Then [that is to say, if thou shalt join these, acts of love and beneficence to thy fasting and religious worship] thy light, &c. that is to say, "Thou shalt in a short time obtain the happy state which thou hast desired, and shalt also be delivered from the evils which oppress thee, and be entirely restored. Thou shalt have God for thy defender and protector, and in all thy prayers and vows, (Isaiah 58:9.) shalt find him propitious, and ready to hear thee." Instead of, ארכתךֶ arukatheka, thy health, Vitringa reads, thy recovery. The idea at the end of the verse is taken from an army, the rear of which is particularly guarded and defended from any attack; or perhaps the allusion may be to the pillar of fire which attended the Israelites in their march through the wilderness.