רוֹמְמ֣וֹת אֵ֭ל בִּגְרוֹנָ֑ם וְחֶ֖רֶב פִּֽיפִיּ֣וֹת בְּיָדָֽם׃
Chwała Pana w głosie ich, a miecz obosieczny w ręku ich.
Haamek Sheilah
David,12David was a descendant of Judah. however, [similarly] to how we described [Yehuda] in chapter 4, did not render decisions based on his own [individual] reasoning. Rather, he would toil greatly in applying pilpul in group study with other scholars. [This interpretation is further buttressed by] Rashi’s explanation of Eruvin, based on the statements in Tractate Mo’ed Katan;1316b. from the verse, “One who sat in the assembly,”14II Sam. 23:8. [we learn that David engaged in group study, sitting on the ground before the scholars].15The full discussion in Mo’ed Katan is: “It is stated in Scripture ‘These are the names of David’s mighty men: who sat in the assembly… Adino the Etznite….’ What does this verse mean? R. Abbahu said, The verse actually states: ‘These are the names of David’s mighty deeds: he sat in a low position.’ When [David] sat in the academy, he did not sit upon mattresses and cushions but on the ground. As long as his teacher, Ira ha-Ya’iri was alive, Ira would teach the rabbis while seated upon cushions and mattresses. When [Ira] died, David would teach the rabbis, and he would sit on the ground. [The rabbis] said to him, ‘Let the Master sit upon cushions and mattresses,’ but he would not sit in an elevated position. ‘He is Adiono the Etznite’ – this implies that when [David] sat and engaged in Torah study, he bent himself like a worm. But when he went out to war, he straightened himself like wood.” It is also written [about David], “In the House of God we would walk in company,”16Psalms 55:15. [i.e., he took counsel with others]. This group interaction ensured that his rulings were established as immutable laws. It therefore follows that [David’s approach to Torah study] also benefited Israel in time of battle, for the sword of Israel is in the merit of applying pilpul to Torah.17The Netziv is saying that the strength of Torah study, which protects the Jewish people, is comparable to a sword. Tractate Shabbos 63a states that the simple meaning of the verse in Psalms 45:4, “Gird your sword upon your thigh, O mighty one, your majesty and your splendor,” is that it refers to the Torah. See also Bereshis Rabbah 24 that explains Psalms 149:6, “A double-edged sword is in their hands,” as referring to the Torah. The reason the Torah is compared to a sword as opposed to any other weapon, is that a sword is has two parts, the sword itself and its sheath, which are respectively symbolic of the Oral and Written Law. In time of peace, the sheath is more significant than the sword, as it denotes the importance and power of the officer who wears it, while the sword itself is not as significant since it is not used. In times of war, however, the sword is greater than the sheath, since then the main purpose of the sheath is not to display its wearer’s status but to protect the sword, whose condition and sharpness are of the highest importance. When Israel is at peace and the Torah, which is composed of God’s holy names, is studied, the Torah functions as the sheath during times of peace that communicates the greatness of the Jewish nation. This idea is hinted at in Deut. 28:10, “Then all the peoples of the earth will see that the name of the Lord is proclaimed over you, and they will fear You.” However, when Israel is at war, the sword – the pilpul of Torah – needs to be sharpened, meaning that the survival and protection of the nation of Israel require the application of deep analysis of the Torah. This is clearly stated in Tractate Makkos 10a, on the verse, “Our feet were standing within your gates, O Jerusalem.”18Psalms 122:2. “Who caused our feet to remain standing in battle? It was when Israel [at the time of King David],19Some explain this verse as describing not what transpired in the time of King David, but as referring to the future Temple. The verse thus describes King David’s recipe for success in battle, which is to be deeply involved in the study of Torah – in other words, pilpul. was involved in the study of Torah, symbolized by the gates of Jerusalem.”
Radak
An open sepulchre is their throat; – They make smooth their tongue: – for he who is not on his guard against them and listens to them when they make smooth their tongue and flatter and appear as friends will fall into their pit (sepulchre); and this is the intention of their heart, which is for evil. And he attributes (the uttering of) words to the throat, as (in the passage): “Let the high praises of God be in their throat” (Ps. 149:6), for some letters are pronounced in the throat. Further, all speech has its beginning from the throat, for the voice proceeds from the throat and makes speech possible to the mouth. Moreover, because the throat is open to the inside, which he compares to a sepulchre, he says their throat. And the word נכונה (straightforwardness) is a feminine adjective, but the substantive is wanting, and we must supply (in thought) אמרה (“utterance”) or דברה (“word”); and so “his meat (m.) is fat” [בראה fem., i.e. “a fat thing,” Hab. 1:16]: “like a flock (of ewes) that are shorn” [lit. “of the shorn ones,” הקצובות, Cant. 4:2]; “he answereth roughly” [lit. “rough things,” עזות; Prov. 18:23]; and similar passages.
Or HaChaim
לפי חרב, "by the sword." In our context these words may be understood as analogous to Psalms 149,6: רוממות קל בגרונם וחרב פיפיות בידם, "when they have songs of praise to G'd in their throats this is equal to having two-edged swords in their hands."