Reference for II Kings 2:17

וַיִּפְצְרוּ־ב֥וֹ עַד־בֹּ֖שׁ וַיֹּ֣אמֶר שְׁלָ֑חוּ וַֽיִּשְׁלְחוּ֙ חֲמִשִּׁ֣ים אִ֔ישׁ וַיְבַקְשׁ֥וּ שְׁלֹשָֽׁה־יָמִ֖ים וְלֹ֥א מְצָאֻֽהוּ׃

And when they urged him till he was ashamed, he said: ‘Send.’ They sent therefore fifty men; and they sought three days, but found him not.