וְהָיָ֗ה כִּֽי־יִרְא֤וּ אֹתָךְ֙ הַמִּצְרִ֔ים וְאָמְר֖וּ אִשְׁתּ֣וֹ זֹ֑את וְהָרְג֥וּ אֹתִ֖י וְאֹתָ֥ךְ יְחַיּֽוּ׃
Y será que cuando te habrán visto los Egipcios, dirán: Su mujer es: y me matarán á mí, y á ti te reservarán la vida.
Chizkuni
והיה כי יראו אותך המצרים והרגו אותי ואותך יחיו, “assoon as they will see me (your husband), they will kill me and let you live;” The Egyptian laws respected the inviolability of a man’s wife. If they wanted to get hold of his wife, their only legal way was to kill the husband on some charge. [One of the perverted concepts of Egyptian morality was that sleeping with another man’s wife is a sin which they are guilty of each time they do so, whereas killing her former husband is a sin that they would commit only a single time. Source: one of the Tossaphists. Ed.] An alternate explanation: Avram feared that he would be killed before he had a chance to appeal to the Egyptian king for justice.
Sforno
והרגו אותי, because they do not expect me to agree to give you to them.
Kitzur Ba'al HaTurim
יחיו 'Yechi' is the first and the second in the tradition, and as for 'yechi' - 'let the grain live and let the vine bloom', since they wished you to live long, they will give you gifts of fields and vineyards.