Hadith 4:718
Ibn ‘Ulayyah narrated to us, from Ayyub, from Nafi‘, who said: ‘Umar said: "If the call [to prayer] reached me while I was between her legs, I would have fasted," or he said: "I would not have broken my fast."
حدثنا بن علية عن أيوب عن نافع قال قال عمر لو ادركني النداء ( ( ( النداؤ ) ) ) وأنا بين رجليها لصمت أو قال ما أفطرت