Which preposition to use with excelsis

of Occurrences 1%

He was the exemplar in excelsis of those "bantams," "little and good," who, after being rejected for their diminutive stature, are now joining up under the new regulations: Apparently he's just as small, But since his size no more impedes him In spirit he is six foot tall Because his country needs him.

Which preposition to use with  excelsis