תלמוד על עירובין 3:8

Rebbi Ḥinena said, everything they made dependent on usage. There were acacia trees in Migdal Sevaya³⁵Since by a Galilean tradition the Tabernacle was built in the desert from perfect logs of acacia wood (Mimosa nilotica L.) cut for this purpose by Jacob and his sons when they travelled to Egypt [Gen. rabba 94(4).]. They came and asked Rebbi Ḥanania, the colleague of the rabbis, may one use them for work? He told them, since your ancestors used to treat them as forbidden, do not change the usage of your deceased ancestors. Rebbi Eleazar in the name of Rebbi Abbin^19,In the other sources: Abun.³⁶Even though all three sources have R. Eleazar in the name of ... , it must be ... in the name of R. Eleazar.. In any case which is permitted but in error he treats it as forbidden, if he asks they will permit him. But in any case where he knows that it is permitted but he has the usage to treat it as forbidden, if he asks they will not permit him³⁷Since he intentionally accepted an unnecessary stringency, it has the status of a vow..