The Mitzva of the Omer which is commanded in Vayikra 23:9-21 is explained in the Talmud, Menachot 64b: to bring the barley reaped for the meal offering from fields proximate to Jerusalem. If the barley did not ripen in the fields proximate to Jerusalem, one brings if from any place in Eretz Yisrael. There was an incident where the Omer came from Gaggot Tzerifin and the wheat for the two loaves on Shavuot came from the valley of Ein Sokher. 

One reason why one brings the barley reaped for the meal offering from fields proximate to Jerusalem is due to the principle that one does not postpone performance of the mitzvot. When presented with the opportunity to perform a mitzva, one should perform it immediately. Therefore,........

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