Question: Some of the pilgrims, when they return from the Holy Land to their countries, they remain in their houses for a week without going out, not even for any necessities nor (going out to the masjid) to pray, and the people engage them in supplicating for them. So is this from the Sunnah?

Response:
This is not from the Sunnah, instead it is an innovation and anyone who believes this to be a Sunnah is mistaken. As for them remaining in their homes without attending the congregational prayers in the masjid, then this is not permissible, except for an Islaamically acceptable reason. For that which has been mentioned, then this is not (an) acceptable (reason), they are therefore sinning for not attending these prayers.

And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet (sal-Allaahu `alayhe wa sallam) and his family and his companions.

The Permanent Committee for Islaamic Research and Fataawa
al-Bid'u wal-Muhdathaat wa maa laa asla lahu - Page 406

Taken from fatwa-online.com