וַתֹּ֕אמֶר יֻתַּ֖ן אֶת־אֲבִישַׁ֣ג הַשֻּׁנַמִּ֑ית לַאֲדֹנִיָּ֥הוּ אָחִ֖יךָ לְאִשָּֽׁה׃
And she said: ‘Let Abishag the Shunammite be given to Adonijah thy brother to wife.’
Read kabbalistic (mystical) interpretation of I Kings 2:21: and classical mystical sources.