Specifically, in Naso 6:25, VeChuNeKah while in the previous pasuk none of them have the dagesh as if often the case. I presume it has something to do with the dagesh chazek in the nun. How does this compare to Bereishis 49:25 in the Birchos Yaakov which have two words that have the Kaph with a dagesh at the end. What are the rules?
Vi Ya-zi re KAH (Bereishis 49:25) vs. Vi Yeesh-Mi re CHAH (Bamidbar 6:24).
Any guidance on the rules?
Which rules of Dagesh Chazak are applying here?