grammar dikduk - In Parshas Chukas, why is first mention of Parah Adumah "פָרָה" instead of "פָּרָה"?

The first mention of the Parah Adumah in Parshas Chukas (Numbers 19:2) is:

דַּבֵּ֣ר אֶל־בְּנֵ֣י יִשְׂרָאֵ֗ל וְיִקְח֣וּ אֵלֶיךָ֩ פָרָ֨ה אֲדֻמָּ֜ה

Instruct the people of Israel to bring you a red cow without blemish

There "פָרָה" is without a dagesh (dot inside) and is pronounced with an "F" sound- "farrah."

However, in describing the rest of the procedure the Torah uses "פָּרָה" with a dagesh, pronounced as "parah" with a hard "P" sound (see 19:5, 19:6 19:9, 19:10)

Question:

Why is the first mention of the Parah Adumah "פָרָה" instead of "פָּרָה"?