עַ֥ל נַהֲר֨וֹת ׀ בָּבֶ֗ל שָׁ֣ם יָ֭שַׁבְנוּ גַּם־בָּכִ֑ינוּ בְּ֝זָכְרֵ֗נוּ אֶת־צִיּֽוֹן׃
Di tepi sungai-sungai Babel, di sanalah kami duduk, bahkan kami menangis ketika kami mengingat Sion.
Mishnah Berurah
The destruction of the Temple - The Shl"a wrote that at every meal, one should recite "Al naharot Bavel" ("By the Rivers of Babylon..." - Psalms 137:1). And on Shabbat, and also on days that Tachanun is not said, one should say "Shir Hama'alot b'shuv Hashem..." ("A song of ascents. When the Lord returns..." - Psalms 126:1). And the main thing is to know/understand what one is saying, and to have concentration.
Tze'enah Ure'enah
Moses spoke to them: my dear children, I cannot take you out of this since it has been decreed before the Holy One, our Lord. God should redeem you soon. All of the shepherds began to cry and shout, as Scripture says, “By the waters of Babylon, there we sat and wept, as we thought of Zion” [Psalms, 137:1]. By the waters of Babylon, there we sat and wept, as we thought of Zion. Then Moses went to the Patriarchs and spoke to them. What have the enemies done to the children? They said: Some of them beat them and some of them bound their hands behind their backs. Some were put in irons, some lie dead, naked in the streets, and the birds and animals eat their flesh. They all began to shout together, woe to us, what has happened to our children. You are like orphans without a father. How you sleep out in the cold, summer and winter in these clothes. You had to climb mountains and rocks barefoot, without shoes. How your hands are tied behind your backs. Then Moses began, cursed be the sun. Why did you not darken when the enemies entered the Temple? The sun responded: Moses, you faithful shepherd, how could I darken? I was lashed with sixty lashes with a fiery whip and I was told: go out and illumine with your light. Then Moses said: O woe over the purity of the Temple, how it has become so darkened. O woe, how has come the time that you have been destroyed and the sanctuary has been burned and the fathers go into exile and captivity? Then Moses said: you captors, I order you by your lives, you should not kill them all and you should be merciful and should not destroy them completely. They should not kill a son before the father and mother and the time will come again when our Lord will again take account of them. They did not do this, but they quickly brought a child and said to the father. Come and slaughter, you must slaughter him yourself. Moses said: Lord of the Universe, it is written in your Torah that one should not slaughter someone and his father in the same day.16Leviticus, 22:28. The evildoers have slaughtered many fathers and mothers and their children in the same day and you are silent about this.