The fighting world is rallying around Francis Ngannou following the death of his son ... with many combat sports stars -- including Manny Pacquaio and Anthony Joshua -- sending their prayers and condolences his way on Monday.
The hearfelt notes were left on Ngannou's Instagram page ... in the comment section of a post where the former UFC champ mourned the loss of Kobe, his 15-month-old son.
"How do you deal with such a thing?" Ngannou said in the post. "How can you live with it?"
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