'Whether' in the Bible

I said {to myself}, "Come! I will test pleasure {to see whether it is worthwhile}." But look, "This also [is] vanity!"

And who knows [whether] he will be wise or foolish? Yet he will exercise control of all [the fruit of] my toil with which I toiled wisely under the sun. This also [is] vanity!

For no one knows [whether] the spirit of a human ascends [to heaven] and [whether] the spirit of the beast descends to the ground!

The sleep of the laborer [is] pleasant, whether he eats little or much, but the wealth of the rich man does not allow him to rest.

So all this I laid to my heart, and I concluded that the righteous and the wise, as well as their deeds, [are] in the hand of God. So no one knows anything that will [come] to them, whether [it will be] love or hatred.

When the clouds are full, they empty rain on the earth. Whether a tree falls to the south or whether it falls to the north, the place where the tree falls--there it will be.

Sow your seed in the morning, and do not let your hands rest in the evening, for you do not know what will prosper-- whether this or that, or whether both of them alike will succeed.

For God will bring every deed into judgment, including every secret thing, whether good or evil.