'Vigor' in the Bible

Reuben, you [are] my firstborn, my strength, and the firstfruit of my vigor, excelling in rank and excelling in power.

But he shall acknowledge the firstborn son of the disliked [wife] {by giving} him a double portion of {all that he has}, for he [is] the firstfruit of his vigor; to him [is] the legal claim of the birthright.

{Now Moses was a hundred and twenty years old} {when he died}; {his sight was not impaired and his vigor had not abated}.

His bones were full of his vigor, but it will lie down with him on [the] dust.

Moreover, {what use to me is the strength of their hands}? With them, vigor is destroyed.

For day and night your hand was heavy upon me. My vigor was changed into [the] dry heat of summer. Selah

Banish anxiety from your heart, and put away pain from your body, for youth and vigor [are] vanity.