Musar for Rosh Hashanah 20:4
אלא לעולם ר"מ וכי קאמר ל' לקליטה
R'Judah said: If a grafting does not take within three days, it will not take all. R'Jose and R'Simeon said that it takes two weeks',<span class="x" onmousemove="('comment',' Sheb. II, 6.');"><sup>3</sup></span>
Shenei Luchot HaBerit
What all this has to do with Samael injuring the כף ירך יעקב, the thigh joint of Jacob, is simple. Our sages say on 32,26: וירא כי לא יוכל לו, ויגע בכף ירכו ותקע כך ירך יעקב, that the thigh joint of Jacob refers to the later descendants who experienced the harsh decrees by the various nations who were their hosts in exile. When the Hasmoneans overcame the Greeks, they reversed this injury, i.e. the כף became a פך a cruse of oil. What had been a vulnerable part of Jacob's ירך now became the solid basis of the candelabra, ירך מנורה.
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