# My life is among lions

"I live among fierce enemies" or "Fierce enemies surround me like lions" 

# those who are ready to devour me

"those who are ready to destroy me" 

# people whose teeth are spears and arrows

"people who kill others with spears and arrows as lions kill with their sharp teeth"

# spears and arrows

Since both of these terms are weapons, if your culture knows only one, it is acceptable to use it alone. 

# whose tongues are sharp swords

"whose cruel words are like sharp swords" or "who cause terrible trouble for me by what they say"