Midrash for Taanit 7:21

Others say: "which I did not command": This refers to the son of Meisha the king of Moav (viz. II Kings 3:27); "and which I did not speak": This refers to the daughter of Yiftach (viz. (Judges 11:31-40); "and which never entered My heart": This refers to Isaac, the son of Abraham (viz. Bereshith 22).