And from him, from Fadalah, from Muawiyah ibn Ammar, who said:
Abu Abdillah عليه السلام, peace be upon him, said: “If you complete the eclipse prayer (salat al-kusuf) before the eclipse clears, then repeat it.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 3, p. 172