There
is a story that once Shanidev (Saturn) said, "During the 7½ and 2½ year
periods when I am in control, my glance ruins everyone on whom it
befalls." Hanuman replied defiantly, "Brother! You cannot disturb the
devotees of my Lord even the slightest." Then and there Shanidev and
Hanuman had a fight to decide who is more powerful i.e. the god or the
devotee. At the end of the brawl, Shanidev lost the bout. He said,
"Hanumanji, I accept defeat, I cannot affect those who are devoted to
God." Then he begged Hanuman to spare him and also asked for some oil to
massage his bruised body. That is how the custom of offering oil to
Shanidev began.
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