עזרא, פרק ג׳, פסוק ד׳

Upon returning to their land, the people renewed the service of the altar by carefully observing the festival of Sukkot. Their focus was not merely on celebrating the holiday, but on fulfilling its intricate requirements precisely as commanded by God. The mention of the festival specifically highlights the holiday's complex sacrificial system [מצודת דוד], which the people carried out exactly as written in the Torah [ביאור שטיינזלץ]. This required bringing the proper burnt offerings for each day in their exact required numbers.

The sacrificial requirements for Sukkot are uniquely complex. While certain offerings remained constant throughout the holiday, such as the fourteen sheep brought daily [מלבי״ם], other requirements shifted. The most distinct feature of the festival is that the total number of burnt offerings changes with each passing day, as the required amount of bulls gradually decreases. The returnees were meticulous in offering the exact, changing number of sacrifices required for every specific day, following the laws of the Torah perfectly [מלבי״ם, ביאור שטיינזלץ].

Their dedication ensured that every sacrifice was brought at its proper time and according to its specific rule. This careful attention to detail emphasizes that the correct and precise action was performed at the exact right moment for every requirement of the festival [אבן עזרא].