The Ark of the Covenant

2 Kings 25, listing what the Babylonians carried off around 586 BCE, never names the Ark. The rabbis of Yoma 53b disputed whether it went to Babylon or was hidden in its place.

2 Kings 25:8-17; Babylonian Talmud, Yoma 53b-54a (Rabbi Eliezer and Rabbi Shimon ben Yohai against Rabbi Yehuda ben Lakish); compare 2 Maccabees 2:4-5, where Jeremiah hides it in a cave.

A gold-overlaid chest of acacia wood made to hold the tablets of the covenant in Israel's sanctuary.

Sources4 sources

Primary source

Hebrew Bible, tr. Jewish Publication Society, Exodus 25:10-22, THE JPS TANAKH: Gender-Sensitive Edition (Sefaria), 2023, Exodus 25:22The Ark's making in acacia wood overlaid with gold, and God's promise to speak to Moses from between the cherubim above its cover.
from between the two cherubim that are on top of the Ark of the Pact
Hebrew Bible, tr. Jewish Publication Society, 2 Kings 25:8-17, THE JPS TANAKH: Gender-Sensitive Edition (Sefaria), 2023, 2 Kings 25:13-17The list of Temple objects the Babylonians broke up and carried off names columns, stands, tank and vessels but not the Ark.
2 Maccabees, King James Version, 2 Maccabees 2 (Wikisource, Bible (King James)/2 Maccabees), 1611, 2 Maccabees 2:4-5The Second Temple-era story that Jeremiah hid the Ark, the tabernacle and the incense altar in a cave on the mountain Moses climbed.
he found an hollow cave, wherein he laid the tabernacle, and the ark

The tradition itself

Babylonian Talmud, tr. William Davidson Edition (Steinsaltz), Yoma 53b-54a (Sefaria), Yoma 53b; 54aThe rabbinic dispute over the Ark's fate (exiled to Babylonia, or hidden in its place) and the reading of the Ark as where the Divine Presence rests.
The Ark was buried in its place