Hymn Lyrics Search - Name That Hymn

hi everyone I play the piano in church and am assigned to handle junior choir in church am looking for a copy of the song:
here am I send me:
chorus goes this way:
my Lord here am I without questioning why
in the land of they choice let me live let me die
I have heard the great call this my only reply
If thou wilt go with me
My Lord here am I

And I must go forth to land of his choice
The land where the maiden
Far over the sea

Hello can you complete the lyrics of the song please?
thank you so much