Answer
Wexler's hypothesis places Jewish-Slavic contact in the 9th century. This hypothesis suggests that Jewish merchants and settlers from the Khazar Khaganate, a powerful multi-ethnic empire in Eastern Europe, played a significant role in the development of Slavic languages and cultures. The contact between these two groups is believed to have occurred during the 9th century, when the Khazars expanded their influence into Slavic territories.