Galatians 4:10 - Matthew Poole's English Annotations on the Holy Bible

If we had any evidence that these Galatians were relapsed to their Gentile superstitions, these terms might be understood of such days, &c. as they kept in honour to their idols. But the apostle, throughout the whole Epistle, not reflecting upon them for any such gross apostacy (as returning to the vanities of the heathen in which they formerly lived); but only for Judaizing, and using the ceremonies of the Jewish law, as necessary to be observed, besides their believing in Christ, for their justification; it is much more probable that he meaneth by days the Jewish festivals, such as their new moons, &c.; by months, the first and the seventh month, when they religiously fasted; by times, their more solemn times, such as were their feasts of first-fruits, tabernacles, &c.; and by years, their years of jubilee, the seventh and the fiftieth year. His meaning is, that they took themselves to be under a religious obligation to observe these times as still commanded by God.