New answers tagged grammar-dikduk
The Tur explains the change. נכחו is referring to the direction from which they approached, like in Yechezkel 46:9. תחנו is referring to the camping of the Jewish people.
It's not always like this as Double AA points out. The reason why you would want to precede them in that order is hinted to by Rashi on the first verse in Bereishis -- Elokim is connected to Judgment and 4-letter Name - to Mercy, and Hashem precedes Mercy to Judgment, hence the names expressing this precedence come in that order.
I found an answer in mitzvot habait page 83 That it is because it was before the pain of child birth (also for the woman) But after the pain it is in singular only the man has the (full) obligation Beraishis 35.11 פְּרֵה וּרְבֵה
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