Adam Clarke on Lamentations 5:1

Remember, O Lord - In the Vulgate, Syriac, and Arabic, this is headed, "The prayer of Jeremiah." In my old MS. Bible: Here bigynneth the orison of Jeremye the prophete.

Though this chapter consists of exactly twenty-two verses, the number of letters in the Hebrew alphabet, yet the acrostic form is no longer observed. Perhaps any thing so technical was not thought proper when in agony and distress (under a sense of God's displeasure on account of sin) they prostrated themselves before him to ask for mercy. Be this as it may, no attempt appears to have been made to throw these verses into the form of the preceding chapters. It is properly a solemn prayer of all the people, stating their past and present sufferings, and praying for God's mercy.

Behold our reproach - הביט hebita. But many MSS. of Kennicott's, and the oldest of my own, add the ה he paragogic, הביטה hebitah, "Look down earnestly with commiseration;" for paragogic letters always increase the sense.