וַתָּבֹ֨א בַת־שֶׁ֤בֶע אֶל־הַמֶּ֙לֶךְ֙ הַחַ֔דְרָה וְהַמֶּ֖לֶךְ זָקֵ֣ן מְאֹ֑ד וַֽאֲבִישַׁג֙ הַשּׁ֣וּנַמִּ֔ית מְשָׁרַ֖ת אֶת־הַמֶּֽלֶךְ׃
And Bath-sheba went in unto the king into the chamber.—Now the king was very old; and Abishag the Shunammite ministered unto the king.—
Ibn Ezra
The word it will yield is irregular, like “ministering to the king” [Hebrew: mesharat] [I Kings 1:15]. Of two consecutive tav’s, one is elided for the sake of euphony.