Eruvin 4 : Marc Chipkin : 2020-08-13 Different measures of an amah, the laws of shiurim, chatzitza and mechitza (sizes, barriers and partitions) have been handed down from Sinai https://drive.google.com/file/d/1Upc7OrIlOpuKoTzL8NtKqCfsOgJM_blh/view?usp=drivesdk