If, for some reason, when reading the Torah on Shabbath morning, a Pasuq (verse) was skipped, then the congregation has to go back to read the missing Pasuq, even if the Torah was already put away and even if Musaf was prayed. They must read the Pasuq that was missed plus two adjacent Pesuqim (verses).
If, however, the Pasuq which was skipped was one of those that was read the previous Shabbath at Minha and during the week on Monday and Thursday, then there is no need to repeat it. If someone, nevertheless, wishes to be strict and read it, it must be read without the blessings.
In a congregation where there are probably many people present who will not have heard the readings during the previous week, it is preferable to go back to the portion missed and to say it without a blessing.
(See Sh.'A. 137:3. Kaf Hahayim ibid: Oth 16. Q. Sh. 'A. H' Toledano, 124:9)
