Coming down from Mount Sinai with the second set of tablets marks the end of a long journey toward forgiveness. It signals the complete restoration of the bond between God and the Israelites, with the new tablets serving as a physical testimony and a lasting guarantee of this renewed covenant [רש״ר הירש].
The physical way Moses came down the mountain reflects a deep reverence for the Divine Presence. Rather than turning his back to the mountain, he walked backward. During his first descent, he had walked backward merely out of fear that he might trip and drop the tablets. However, during this second descent, he maintained this respectful posture for the entire journey until he finally placed the tablets in the ark [העמק דבר].
The timing of this return adds a layer of complexity, as it took place on the Day of Atonement [חזקוני, צפנת פענח]. This creates a unique legal situation regarding the laws of the day. Carrying the tablets from the private domain of the mountain into the public domain of the Israelite camp was forbidden. To honor this law, Moses left the tablets on the mountain during the day and waited until nightfall to place them inside the ark [צפנת פענח]. He had prepared this ark immediately after coming down from the mountain [רמב״ן, הטור הארוך].
There are two main perspectives on how long the tablets stayed in this specific ark. One approach explains that they remained in Moses' temporary wooden ark for a significant amount of time. They were kept there, on the mountain itself, until the first day of the month of Nissan when the Tabernacle was erected and they were transferred to the permanent ark crafted by Bezalel [אור החיים, שד״ל, העמק דבר, צפנת פענח]. This extended time in a simple wooden box carries a symbolic meaning, reflecting how a dedicated Torah scholar might endure a long period of difficulty and humble circumstances before God eventually elevates their standing [העמק דבר]. The second approach views their placement in the ark as a statement of permanence. The tablets were deposited there to remain forever, ensuring that the glory of God would constantly dwell among the Israelites [רמב״ן, הטור הארוך].