During recitation of the Hanumaan Chaalisa, many people are heard to be speaking:
Raam rasayan tumhre paasa,
Sadaa raho raghupati ke daasa.
which appears to be an order being given to Shri Hanumaan to remain a devotee to Shri Raam.
Around 15 years ago, I read the following lines instead of the above mentioned ones for shlok no. 32 in a Hanumaan Chaalisa book:
Raam rasayan tumhre paasa,
Saadar hey raghupati ke dasaa.
---------
Jai Shree Hanumaan.
Jai Shree Raam.
