Exodus 12:5-6
perfect <08549> [be without.]
male ... year old <02145 01121 08141> [a male of the first year. Heb. son of a year.]
fourteenth <0702> [fourteenth.]
whole <03605> [the whole.]
around sundown <06153 0996> [in the evening. Heb. between the two evenings.]
The Jews divided the day into morning and evening: till the sun passed the meridian, all was morning or forenoon; after that, all was evening or afternoon. Their first evening began just after twelve o'clock, and continued till sunset; their second evening began at sunset, and continued till night, i.e., during the whole time of twilight; between twelve o'clock, therefore, and the termination of twilight, the passover was to be offered. See Parallel Passages.