If the household be too little for the lamb. — There would be cases where the family would not be large enough to consume an entire lamb at a sitting. Where this was so, men were to club with their neighbours, either two small families joining together, or a large family drafting off some of its members to bring up the numbers of a small one. According to Josephus (Bell. Jud., vi. 9, § 3), ten was the least number regarded as sufficient, while twenty was not considered too many.
Every man according to his eating shall make your count for the lamb. — Rather, shall ye count. In determining the number for any given Paschal meal, ye shall “count men according to their eating,” admitting more or fewer, as they are likely to consume less or more.