A Rebbi of mine in yeshiva said in the name of Rav Ruderman z"tl who referred to a Chazal that a person should ideally try to marry someone from the "same ืืืื (street), if not then the same ืฉืืื ื (neighbourhood), and if not then the same ืขืืจ (city)," explaining that the fewer differences there are, the easier the adjustment which is required for marriage.
My question is where this Chazal is located? (My Rebbi wasn't sure, although I was wondering if it's Yalkut Shimoni 391:14)