A man who says to his wife: if you become pregnant you are divorced

Qatadah (may Allah have mercy on him) said: If a man says to his wife, "When you become pregnant, you are divorced," then he should have intercourse with her once in each period of purity and then not have intercourse with her again until she becomes pure after her next menses; when her pregnancy becomes evident, she is irrevocably separated.

Al-Hasan (may Allah have mercy on him) said: If a man says to his wife, "When you become pregnant, you are divorced," he may have intercourse with her after she becomes pure from her menses, and then refrain from her until the next such time.

Ibn Sirin (may Allah have mercy on him) said: He may have intercourse with her until she becomes pregnant.