וְאַ֨בְרָהָ֔ם בֶּן־תִּשְׁעִ֥ים וָתֵ֖שַׁע שָׁנָ֑ה בְּהִמֹּל֖וֹ בְּשַׂ֥ר עָרְלָתֽוֹ׃
Abraham berumur sembilan puluh sembilan tahun ketika kulit khatannya disunat.
Rashi
בהמלו WHEN HE WAS CIRCUMCISED — a Niphal form (passive), like (Genesis 2:4) בהבראם “when they were created”.
Radak
ואברהם בן תשעים ותשע שנה, when he received the most recent prophetic vision he was 99 years old as already mentioned in verse 1. This had been at the end of 99 years after his birth, so that when he was circumcised he was still 99 years of age, and had not entered the 100th years. The Torah writes this in order to reinforce the report that he carried out the circumcision with dispatch, and did not wait until he had turned 100 years old.
Rabbeinu Bahya
בהמולו בשר ערלתו, “when he was circumcised on the flesh of his foreskin.” The procedure followed exactly the instructions he had received in verse 11. The Torah teaches us here that this commandment leaves a permanent mark on the flesh of a person so that this mark can be considered the sign of the covenant. This is why this commandment is known for short simply as אות, “sign.”
There are a total of tree commandments in the Torah which are called אות, “sign.” They are: circumcision, Sabbath, and phylacteries. All of them, i.e. performance of them by a Jew are testimony to his belief in G-d and His Torah. It is not appropriate for a Jew to not have at least two of these commandments as his advocates. Maintaining a claim to something successfully requires that the claim be supported by two valid witnesses (Deut.19,15). This is why a Jew needs to constantly move in the company of two such witnesses. They are the circumcision and the commandment of the תפילין, the phylacteries. They should never deport from him. A Jew who is careful to mind this may say of himself as did Rabbi Zeyra (Megillah 28) “I have never walked four cubits without Torah and without the phylacteries.” On the Sabbath, when the commandment to wear phylacteries does not apply, one still has both the Sabbath and the sign of the covenant on one’s flesh as the two valid witnesses which one should never be without. From the above we learn that observing the commandment to wear phylacteries fastidiously means that one is never without the protection of these two witnesses who may testify on one’s behalf.
There are a total of tree commandments in the Torah which are called אות, “sign.” They are: circumcision, Sabbath, and phylacteries. All of them, i.e. performance of them by a Jew are testimony to his belief in G-d and His Torah. It is not appropriate for a Jew to not have at least two of these commandments as his advocates. Maintaining a claim to something successfully requires that the claim be supported by two valid witnesses (Deut.19,15). This is why a Jew needs to constantly move in the company of two such witnesses. They are the circumcision and the commandment of the תפילין, the phylacteries. They should never deport from him. A Jew who is careful to mind this may say of himself as did Rabbi Zeyra (Megillah 28) “I have never walked four cubits without Torah and without the phylacteries.” On the Sabbath, when the commandment to wear phylacteries does not apply, one still has both the Sabbath and the sign of the covenant on one’s flesh as the two valid witnesses which one should never be without. From the above we learn that observing the commandment to wear phylacteries fastidiously means that one is never without the protection of these two witnesses who may testify on one’s behalf.