The 'peace' as you have been taught quoted by Masood's son is what the Prophet taught in the final sitting when he said, "Peace be upon us and upon the righteous worshipers of Allah."
The 'nabad' sida aad waxa lagu baray oo soo xigtay ina Masood ee waa wixii Nabiga baray in fadhigii final markuu ku yidhi, "Peace noo korkaaga iyo caabudayay kuwa dhawrsada Eebe u noqon."