I believe this is the Manjusri mantra in Sanskrit:
oṃ a ra pa ca na dhīḥ
A is a door to the insight that all dharmas are unproduced from the very beginning (ādya-anutpannatvād);
RA is a door to the insight that all dharmas are without dirt (rajas);
PA is a door to the insight that all dharmas have been expounded in the ultimate sense (paramārtha);
CA is a door to the insight that the decrease (cyavana) or rebirth of any dharma cannot be apprehended, because all dharmas do not decrease, nor are they reborn;
NA is a door to the insight that the names [i.e. nāma] of all dharmas have vanished; the essential nature behind names cannot be gained or lost.
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Now having obtained a precious human body,
I do not have the luxury of remaining on a distracted path.
~ Tibetan Book of the Dead