וַיְכַ֤ל אֱלֹהִים֙ בַּיּ֣וֹם הַשְּׁבִיעִ֔י מְלַאכְתּ֖וֹ אֲשֶׁ֣ר עָשָׂ֑ה וַיִּשְׁבֹּת֙ בַּיּ֣וֹם הַשְּׁבִיעִ֔י מִכָּל־מְלַאכְתּ֖וֹ אֲשֶׁ֥ר עָשָֽׂה׃
到第七日,上帝完成了祂所造的工;第七日,祂停止了祂所造的一切工。
Rashi
ויכל אלהים ביום השביעי AND ON THE SEVENTH DAY GOD FINISHED — R. Simeon says: A human being (literally, flesh and blood) who cannot know exactly his times and moments (who cannot accurately determine the point of time that marks the division between one period and that which follows it) must needs add from the week-day and observe it as the holy day (the Sabbath), but the Holy One, blessed be He, who knows His times and moments, began it (the seventh day) to a very hair’s breadth (with extreme exactness) and it therefore appeared as though He had completed His work on that very day (Genesis Rabbah 10:9). Another explanation: What did the world lack? Rest! Sabbath came — Rest came; and the work was thus finished and completed (Genesis Rabbah 10:9)!
Radak
ויכל ביום השביעי, by the time the seventh day had started, all G’d’s work had been completed so that there was no creative activity left for G’d to perform on the seventh day. It is therefore technically correct to state that the meaning of the words is that G’d’s work had been completed, and completion of work cannot be termed “work.” The meaning of the words אשר עשה, therefore is that “all the creative activities which G’d had performed during the preceding six “days” had been terminated with the advent of the seventh day, so that there was nothing left to be done on that day.” We have similar constructions in the Torah, for instance in Exodus 12,16 ביום הראשון תשביתו שאור, which means that on that day leavened things should be in a state of having been destroyed, banished. (compare Pessachim 5) וישבות, He discontinued, what He had completed (שבת).
Sforno
ויכל אלוקים ביום השביעי, at the beginning of the seventh “day,” a moment which is indivisible from the time frame which follows, so that both the six previous “days” were an entity in themselves, and the seventh day was a totally self-contained entity. Our sages in Bereshit Rabbah 10,9 describe G’d as knowing the precise moment between the sixth and seventh day and describe it as “thin as a hair’s breadth.” [I believe the problem confronting the sages was the statement that G’d had completed all His work in the six days, and yet the Torah speaks of Him completing, ויכל, His work on the ”seventh” day, something that appears to be a contradiction to the former statement. Ed.]