Radak

Thou hast seen: – The yodh of the third radical is missing from the form as written. The wicked man says that Thou dost not see; but Thou hast seen all. For Thou – assuredly beholdest mischief and spite: – The mischief and spite which the wicked exhibits towards the poor, Thou beholdest it. To put (the matter) in Thine hand: – when it shall please Thee to. exact the judgment of the poor from the wicked. For To Thee the hapless leaveth: – the hapless, i.e. he that is poor, (leaveth) his cause; for often has he seen that Thou hast been the helper of the fatherless: – for Thou hast been the helper of the fatherless and the weak, therefore he waits for Thee and leaves his cause to Thee. And in חלכה the he is added, as we have (already) explained (supra, 5:8).