However...

However, in the course of performing sa'y, it is permissible to sit at Safa, Marwah, or between them for rest. Yet one must, as a matter of precaution, avoid having a break in the process, except for those who are tired, or need to interrupt sa'y to catch up with prayer at the earliest time. In these cases, one may complete the sa'y from where it had been interrupted. It is also permissible to interrupt sa'y to attend to a need, indeed at all times.

Yet one should, as a matter of precaution, complete it and then repeat it. Rules of Sa'y Sa'y is one of the fundamentals of Hajj. If one deliberately fails to perform it - whether conversant with the rule or not - to the extent that it becomes impossible to complete Umrah rituals in time (i.e. before the zawaal of wuquf at Arafat) the Hajj is invalidated. The rules applicable to such a pilgrim are the same as those governing the one who deliberately fails to perform tawaf.

These have already been discussed under Tawaf. Rule 341: If a pilgrim forgets to perform sa'y, he must perform it whenever he remembers. However, if one remembers after completing the ceremonies of Hajj, and is unable to perform sa'y personally, because of some constraint or difficulty, he must resort to appointing an agent. In both the cases, the pilgrimage will be valid.

Rule 342: If a pilgrim is unable to perform sa'y in time, even with the another person's help, he must enlist the service of another, who could carry him or push him in a wheelchair. If help was not at hand, he may hire an agent to perform sa'y on his behalf. Inability to use a proxy, due to ill health, could be resolved by the pilgrim's next of kin, or another person, carrying it out for him. Hajj, in both the cases, will be valid.

Rule 343: A pilgrim must, as a matter of precaution, not delay performing sa'y, after having completed tawaf and its prayer. Evidently, though, it is permissible to delay it till night time to overcome tiredness or avoid hot weather, indeed at all circumstances - on the strength of the evidence (alal aqwa). Nevertheless, it is not permissible to delay it to the next day. Rule 344: The rule, governing the doubt of doing extra rounds in sa'y, is exactly the same as the that governing tawaf.

It invalidates the sa'y if, knowingly and deliberately, additional rounds are made. However, if the lapse occurs out of ignorance of the rule, sa'y will evidently not be invalidated, albeit repetition is recommended, as a matter of precaution.