Ezekiel 23:2

Son of man, there were two women, the daughters of one mother:

Cross-reference

Ezekiel 16:46 names Samaria as elder sister and Jerusalem as younger — directly parallel to the two sisters.

Ezekiel 16:44 cites the proverb 'like mother, like daughter', connecting to the 'daughters of one mother' here.

Jeremiah 3:7-10 portrays Israel and Judah as two unfaithful sisters, using the same allegory of marital infidelity.