«فِي لَيْلَةٍ أَدِيمُهَا ذُو لَوْنَيْنِ»
A night whose outer covering had two colours.
The word for skin or surface is attached to the night, giving time a palpable covering. The two colours invite a visual sense of mingled light and darkness.
The image establishes mood rather than an exact astronomical hour. The textured setting prepares the reader for the knock at the door that follows.