誓 is a Japanese kanji written with 14 strokes, listed here under the keyword “vow”. It is built from 折 (fold) and 言 (say). In Remembering the Kanji by James W. Heisig it is frame 1214.
On KumiJi Glyph Explorer, open the parts search and type “fold” + “say”. 誓 is among the results, together with every other character containing the same shapes.
Open 誓 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.