In Parshas Toldos it says that after leaving Avimelech, Yitzchok planted a field and was so successful with its planting that it produced “Meah Sharim” 100 times more. Rashi explains why Yitzchok measured the field’s production. The reason is so he could give maaser on what grew.

In Parshas Vayeitzei, Yaakov promised Hashem that everything you will give to me, “Aser Aasrenu Lach.”

The Baalei Tosfos bring down the Medrash that says that Yaakov established the concept of maaser from monetary earnings. That is where we learn the concept of giving a fifth of one’s money to tzedaka. We learn this from the double lashon of aser aasrenu; two times a tenth, which is a fifth. The Rambam in Hilchos Melachim 9:1 says that Yitzchok established maaser. The Raavad argues with this position and says that we find that Avrohom already gave maaser prior to Yitzchok. The Kesef Mishna says that Avrohom did not give maaser, he gave the money as tzedaka. The proof is that he did not give maaser from all his wealth, he only gave Shem from the spoils of war. Conversely, Yitzchok gave maaser from every crop that grew in his field.

There is a machlokes Rishonim regarding giving maaser from monetary earnings. Is the din of giving maaser from money the same as giving maaser from grain? Is giving money considered tzedaka with a base minimum of one tenth and a maximum of a fifth of one’s money?

We could try to reconcile this by saying that each of our Avos established a different part of maaser. Avrohom gave maaser as tzedaka, not b’Toras maaser. Yitzchok gave maaser from the grains that grew. Yitzchok also gave maaser of his money, but that was b’Toras tzedaka. Yaakov was mechadesh that a person must give money b’toras maaser.

The Shita Mekubetzes in Kesubo 50a says that when one earns money, he should take off a tenth and use it for his own religious purposes. He should then take off another tenth and use it to give to the poor. He explains that it is similar to the two maasros we give on grain or fruit. One maaser was taken up to Yerushalayim for personal consumption and the other maaser was given to the poor. It could be that this is what Yaakov meant with the double lashon of “aser aasrenu lach.” He did not say “Achamshenu,” I will give a fifth. He said, “I will give two tenths.” We know that one may not take maaser from a crop that was already tithed in order to fulfill maaser for another crop that was not yet tithed. Hence, we learn that the two crops cannot be mixed together until both are properly tithed. Similarly, one may not be mafrish a fifth for two tenths of what he wants to give maaser, he has to do it in two steps: first one tenth and then another tenth.

We see the great value in giving maaser when the Gemara explains “Aser bishvil Shetisasher.”  One who gives maaser will become rich. Maaser is the perfect investment.

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