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Rashi on this Posuk says that He loosened their muzzles, for he had sealed their mouths, so they (the camels) should not graze in other people’s fields. The Ramban among many others asks a question on this Pshat. The Gemara says that the donkey of Reb Pinchas Ben Yair would not eat from non Tithed (not taken Masser from) crops, so why is it that for Avraham Camels we are concerned? To answer Let me begin with a story that happened in an office to illustrate a point. There was a person who worked in a frum office and brought his own milk and every day. The milk would mysteriously go missing at the end of every day. He tried many different preventative measures including writing “Lo Signov” on the milk all of this accomplished nothing, as everyday his milk was still missing. Then one day he had a bright Idea. He poured the milk in a container that was Chalav Stam and low and behold the milk was there at the end of the day untouched. Now we have the answer to the original question a Donkey will not eat un-tithed food yet when it comes to Dishonesty it might not be so stringent.