Pesachim 87a: This refers to male youths of Yisrael who never sinned.

Shocher Tov: Our sons will grow like cedars.

Rashi: Also now, this generation is Kosher. Our sons have no Mum - they are clean from sin. Their good repute from their youth will last all their days ¹ . This refers to the generation of Chizkiyah

Radak: Just like saplings grow on much water, and in a fat (fertile) place, so our sons grew with great good, straight Emunah and good deeds ² .

Alshich: Males go out of the house, like saplings. There, one is prone to learn bad paths, especially in youth - even so, they are Megudalim (mature).

Malbim: If one is careful that a sapling grow straight, the tree will be straight. If it is crooked when young, it will be a crooked tree. Therefore, one must straighten boys in their youth; then, also in old age they will go straight.

Rashi, based on Pesachim 87a: This refers to Benos Yisrael who are full of desire, like the Zaviyos (corners) of the Mizbe'ach are full of blood, but they bind their [genital] openings and have relations only with their husbands.

Bava Basra 75a: In the future, the gates of Yerushalayim will be 100 Amos tall, like the Heichal was [in Bayis Sheni. "Baneinu" hints to Binyan, and Mechutavos refers to the cavities in them. - Maharsha 75a]

Shocher Tov: The daughters will not need to adorn themselves. They will be white like the plaster of the Heichal, and red like the blood ¹ on the Zaviyos (corners) of the Mizbe'ach.

Rashi #1: Our daughters have a pleasant height, like the corners of a stone house (the rocks are the same height).

Rashi #2: All who see our daughters praise them, and compare them to the height of the Heichal ² .

Radak: Also our daughters grew with great good, and they are beautiful, and their height is like the corners of the Heichal, and their form is beautiful like the Heichal. (Refer to 144:12:2:4-5 and the note there.)

Alshich: Our daughters do not leave the house. Further, they are not visible to those who pass by the opening, or just entered - rather, they are out of view, like the corners. This is not amidst shame over their appearance - they are beautiful like the Heichal, in whiteness, form and height. And just like only the Kohen Gadol, who is special for the Heichal ³ , enters it, so each girl, only the man (husband) special for her comes to her.

Metzudas David: Just like the corners of a king's palace are perfectly straight, there is no crookedness, Aveirah or lewdness in our daughters.

Malbim: The form of a palace is known from the corners, if it is straight. So our daughters are modest, and sit in the sides of the house. Even so, they define the form of the entire palace; according to their virtue, so is the conduct of the house.

Pesachim 87a: The verse attributes to both [the sons and daughters] that it is as if the Heichal was Nivneh (built) in their days.