Read Numbers 9:11 Using Other Translations
The fourteenth day of the second month at even they shall keep it, and eat it with unleavened bread and bitter herbs.
In the second month on the fourteenth day at twilight they shall keep it. They shall eat it with unleavened bread and bitter herbs.
They must offer the Passover sacrifice one month later, at twilight on the fourteenth day of the second month. They must eat the Passover lamb at that time with bitter salad greens and bread made without yeast.