This passionate prayer for peace is attributed to a Palestinian source in several Global Song collections.

While the pronunciation of Arabic can differ from country to country, here is a recording of the text in the original language to guide you. 

Yarabba ssalami amter alayna ssalam,
Yarabba ssalami im la’ qulubana ssalam.

Poetic translation:
God of Peace, rain peace upon us,
fill our hearts with peace.

Singing translation:
God of peace and of justice, rain down upon us your peace.
God of peace and of justice, fill every heart with your peace.