سورة الرعد

Imam Baqir and Imam Sadiq (peace be upon them): al-Ghayd (that which the wombs fall short of) is every pregnancy of less than nine months. And "وَمَا تَزْدَادُ (what they increase)" means whatever exceeds nine months; so whenever a woman sees pure blood during her pregnancy, [the term of the pregnancy] is extended by the number of days on which she saw blood during her pregnancy.

Imam Baqir and Imam Sadiq (peace be upon them): al-Ghayd means a period shorter than the [normal] time of pregnancy. And "وَمَا تَزْدَادُ" is that time which extends beyond the [normal] time of pregnancy; that is, it replaces the days on which she saw blood during her pregnancy.

Imam Sadiq (peace be upon him): Zurarah narrates: Imam Sadiq (peace be upon him) said: "اللهُ یَعْلَمُ مَا تَحْمِلُ کُلُّ أُنثَی [Allah knows what every female bears] means: whether it is male or female. وَ مَا تَغِیضُ الأَرْحَامُ [and that of which the wombs fall short]; a foetus that is less than nine months old is al-Ghayd. وَ مَا تَزْدَاد [and that in which they increase]; whenever a woman sees blood during her pregnancy, that period is added to the nine months. So if she sees blood for five days, or more or less, it is added to the nine months."

Ali ibn Ibrahim (may Allah have mercy on him): اللهُ یَعْلَمُ ما تَحْمِلُ کُلُّ أُنْثی وَ ما تَغِیضُ الْأَرْحامُ وَ ما تَزْدادُ وَ کُلُّ شَیْءٍ عِنْدَهُ بِمِقْدارٍ [Allah knows what every female bears, and that of which the wombs fall short of completion and that in which they increase; and there is a measure with Him of everything]. ما تَغِیضُ; that is, what falls before reaching completion. وَ ما تَزْدادُ; that is, what is added beyond the nine months. Whatever menstrual blood a woman sees during her pregnancy, that same period is added to her pregnancy.

Imam Baqir and Imam Sadiq (peace be upon them): مَا تَحْمِلُ کُلُّ أُنثَی [what every female bears]; whether it is male or female. وَ مَا تَغِیضُ الأَرْحَامُ [and that of which the wombs fall short]; what has not yet conceived. وَ مَا تَزْدَاد [and that in which they increase]; from female or male.

Imam Sadiq (peace be upon him): Muhammad ibn Muslim says: I asked Imam Sadiq (peace be upon him) about the verse: مَا تَحْمِلُ کُلُّ أُنثَی وَ مَا تَغِیضُ الأَرْحَامُ [what every female bears, and that of which the wombs fall short]. He said: "It means that she is not pregnant, and what is meant by وَ مَا تَزْدَادُ [and that in which they increase] is: its being male and female together."