You can say "Rabbi" as it means "My Lord".
"Rabbahu" means "His Lord".
But, in the Qur'an it is said "rabbahu anni" not "rabbahu inni", the meaning goes wrong.
You could say,
Rabbi anni maghloobun fantasir
Or else,
Rabbahu anni maghloobun fantasir.
How To Correct Words i am Confused
رَبُّ اَنِّىْ مَغْلُوْبٌ فَانْتَصِرْ Alif in this has zabbar
and
رَبِّ اِنِّىْ مَغْلُوْبٌ فَانْتَصِرْ[ Alif has zer.COLOR=#050505]
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Aslaam o AlaikumSecond version Alif with Zer not zabar
wa 'alaykum salaam wa ra7matullah wa barakaatuh,
رَبِّي إِنِّي مَغْلُوبٌ فَانْتَصِرْ
is it anni or inni