Zechariah 8:23
"Thus says the LORD of hosts: 'In those days ten men [representatives of the Lost Ten Tribes of Israel?] from every language of the nations shall grasp the sleeve of a Jewish man, saying, 'Let us go with you, for we have heard that God is with you.'"
Interesting. I have used that verse VERY often (just ask around) but that's the first time somebody asked if it was a reference to the Ten Lost Tribes of Israel.
Rashi says this about that verse:
"ten men from the seventy nations. This equals seven hundred for each corner. For the four corners of the tallith there will be two thousand and eight hundred."