For of necessity he must release one,.... And therefore proposed to release Jesus unto them at the feast; of passover, which now was; not that there was any law that obliged to it, but it having been customary with the Roman governor to do so, the people expected it; custom had made it necessary: and so the Syriac, Arabic, and Persic versions render it, "it was a custom to release", &c. not at each feast, or every feast, as the last of these versions read, only at the passover, as is expressed, Joh 18:39.