God will remember His mercy
"Then the LORD said to Abraham, “Why did Sarah laugh? Why did she say, ‘Can an old woman like me have a baby?’"
(Genesis 18:13 NLT)
"Is anything too hard or too wonderful for the Lord? At the appointed time, when the season [for her delivery] comes around, I will return to you and Sarah shall have borne a son."
(Genesis 18:14 AMP)
"The Lord said to Moses, Has the Lord’s hand (His ability and power) become short (thwarted and inadequate)? You shall see now whether My word shall come to pass for you or not." (Numbers 11: 23 AMP)
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