Raising the hands in Salah is recommended in three places according to the Madhhab – (Hanbali Fiqh)

Answered according to Hanbali Fiqh by TheHanbaliMadhhab.com

1. The opening Takbir
2. Going down for Ruku’
3. Coming back up from Ruku’

Most of the authentic narrations mention these three places only, without a fourth place, and this is what Imam Ahmad (r) went with.