Midrasch zu Schemuel I 15:1

2. "And Sarai said to Abram, 'Look, the Lord has kept me from bearing' (Gen.16:2) as follows: "Said she, I know the source of my affliction: It is not as people say [of a barren woman], 'she needs a talisman, she needs a charm', but Look, the Lord has kept me from bearing.'" It is taught: whoever has no child is like one who is dead, like one who is destroyed. Like dead, since it is written "And Rachel said to Yaakov: give me children [or I shall die]" (Genesis 30:1). Destroyed, as it is written "maybe I will be build from her" (Genesis 16:2) - we build only what was destroyed.