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ולכה איפה. ולכה כתיב בה"א מלא אמר לו יצחק לעשו לאחר שיעברו חמשת אלפים אז ימלוך מה אעשה לך שאז יתן הקב"ה נקמתו באדום: ולכה איפוא, what then can I do for you? the word ולכה here is spelled with the letter ה at the end, (numerical value of 5) something most unusual; Yitzchok hinted to Esau that after 5000 years of human history will have passed his descendants will achieve superiority on earth, but that seeing that he, Esau, will wind up in Gehinom, he, his father, cannot do anything in the meantime to interfere with G–d’s decree.