وَقَالَ مَالِك: الشَّفَقُ الْحُمْرَةُ الَّتِي فِي الْمَغْرِبِ ، فَإِذَا ذَهَبَتِ الْحُمْرَةُ فَقَدْ وَجَبَتْ صَلَاةُ الْعِشَاءِ ، وَخَرَجْتَ مِنْ وَقْتِ الْمَغْرِبِ
Imam Malik, may Allah have mercy on him, said: Shafaq refers to the redness that appears in the west, so when the redness disappears, the time for the Isha prayer will come and the time for the Maghrib prayer will have passed.