# Only if the highest heavens can be measured, and only if the earth's foundation below can be discovered, will I reject all of Israel's descendants

"Just as the highest heavens can never be measured, and the earth's foundation below can never be discovered, I will never reject all of Israel's descendants"

# the highest heavens ... earth's foundation

These phrases refer to the whole of creation.

# the earth's foundation below can be discovered

"someone can dig all the way down to the earth's foundation"

# foundation below

"deepest part." The part of a house on which every other part rests.

# reject

throw away or refuse to take