The source of listening to the high court typically comes from Devarim 17:8-10:
If there arise a matter too hard for thee in judgment, between blood and blood, between plea and plea, and between stroke and stroke, even matters of controversy within thy gates; then shalt thou arise, and get thee up unto the place which the LORD thy God shall choose. And thou shall come unto the priests the Levites, and unto the judge that shall be in those days; and thou shalt inquire; and they shall declare unto thee the sentence of judgment. And thou shalt do according to the tenor of the sentence, which they shall declare unto thee from that place which the LORD shall choose; and thou shalt observe to do according to all that they shall teach thee.
So after the Sanhedrin left Jerusalem and moved to Yavne (i.e not in the place which Hashem had chosen), what is the source that this commandment was still in effect?
Note: I saw in this pdf (top of page 5) that the Sifri (Devarim - Shoftim 153) brings part of the above posukim and says that the mitzvah includes when they are in Yavne (in so many words). The author then relays that there are other places where Chazal explain that the mizvah is in effect outside of Jerusalem, including in the Yerushalmi. This question ideally is mostly looking for those sources.