Judæo-Aramaic language

Judæo-Aramaic is a group of Hebrew-influenced Aramaic and Neo-Aramaic languages.

Aramaic, like Hebrew, is a Northwest Semitic language, and the two share many features. From the 7th century BCE, Aramaic became the lingua franca of the Middle East. It became the language of diplomacy and trade, but it was not yet used by ordinary Hebrews. As described in 2 Kings 18:26, the messengers of Hezekiah, king of Judah, demand to negotiate with Assyrian ambassadors in Aramaic rather than "Judean" (or "Judahite") so that the common people would not understand.

During the 6th century BCE, the Babylonian captivity brought the working language of Mesopotamia much more into the daily life of ordinary Jews. Around 500 BCE, Darius I of Persia proclaimed that Aramaic would be the official language for the western half of his empire, and the Eastern Aramaic dialect of Babylon became the official standard. In 1955, Richard Frye questioned the classification of Imperial Aramaic as an "official language", noting that no surviving edict expressly and unambiguously accorded that status to any particular language.

Documentary evidence shows the gradual shift from Hebrew to Aramaic:

The phases took place over a protracted period, and the rate of change varied depending on the place and social class in question: the use of one or other language was probably a social, political, and religious barometer.

The conquest of the Middle East by Alexander the Great in the years from 331 BCE overturned centuries of Mesopotamian dominance and led to the ascendancy of Greek, which became the dominant language throughout the Seleucid Empire, but significant pockets of Aramaic-speaking resistance continued.

...
Wikipedia