שִׁיתָ֣ה יְ֭הוָה שָׁמְרָ֣ה לְפִ֑י נִ֝צְּרָ֗ה עַל־דַּ֥ל שְׂפָתָֽי׃
Walang-Hanggan, maglagay Ka ng bantay sa aking bibig; bantayan Mo ang pintuan ng aking mga labi.
Rashi
O Lord, place a guard for my mouth when I pray before You, that I should speak poetically, that it should be acceptable.
Rashi
the portal of my lips That is the upper lip (like portals of my lips).