There is no prescribed or liturgical prayer to accompany that gesture.
However, once can appropriately say, silently, these words or something similar,
“May the words of the Holy Gospel be in my mind, in my mouth, and in my heart,” since this is what this gesture means.
and in some cases:
“May the Word of God be on my mind, on my lips, and in my heart”. The priest says this while crossing himself on the forehead, lips and heart. The people do also.
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