Sayyiduna Anas (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "The sea was split for the Children of Israel on the day of Ashura."
Abu Ya'la recorded it. Its chain contains a narrator, Yazid al-Raqashi; he has been criticised, though he has been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5133