Ahmad ibn Muhammad ibn ‘Isa narrated from Muhammad ibn Abi Hamzah, from someone who mentioned it:
Abu Abdillah عليه السلام said: “Cursed is the one who delays Maghrib seeking its (imagined) merit.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 34