“Mingled fluids” means mixtures; its singular is mashj or mashīj, like khidn and khadīn.
Ibn Abbas, al-Hasan, Mujahid, and al-Rabi said: It means the fluid of the man and the fluid of the woman (1), which mingle in the womb, and from them the child is formed. The man’s fluid is thick and white, while the woman’s fluid is thin and yellow. Whichever of them predominates over the other, the child resembles it. Whatever consists of sinews and bones comes from the man’s seminal fluid, while whatever consists of flesh, blood, and hair comes from the woman’s fluid. (2)
Al-Dahhak said: By “mingled fluids,” He meant the differing colors of the seminal fluid: the man’s fluid may be white, red, or yellow, while the woman’s may be green, red, or yellow. (3) This is also the report of al-Walibi from Ibn Abbas. Al-Kalbi likewise said: “Mingled fluids” are whiteness mixed with redness and yellowness. Yaman said: Any two colors that are mixed together are mingled fluids. Ibn Masud said: They are the veins found in the seminal fluid.
Al-Hasan said: It is seminal fluid mixed with blood—the blood of menstruation. When a woman becomes pregnant, menstruation ceases.
Qatadah said: They are the stages of creation: seminal fluid, then a clinging clot, then a lump of flesh, then bone, then He clothes it with flesh, and then brings it forth as another creation. (4)
“We test him” means: We test him through commands and prohibitions. “Then We made him hearing and seeing.” Some scholars of Arabic said that the wording involves an inversion; its intended sense is: “Then We made him hearing and seeing in order to test him,” (5) because testing only takes place after the completion of creation.
“Indeed, We guided him to the way, whether he be grateful or ungrateful. Indeed, We have prepared for the disbelievers chains, shackles, and a blazing Fire.” (3–4)
“Indeed, We guided him to the way” means: We made clear to him the path of truth and falsehood, guidance and misguidance, and made known to him the way of good and evil. “Whether he be grateful or ungrateful” means: either a believing and blessed person, or a disbelieving and wretched one. It was also said that the meaning concerns requital; that is, We made the path clear to him, whether he gave thanks or disbelieved. (6) He then explained what awaits the two groups, saying: “Indeed, We have prepared for the disbelievers chains”—that is, in Hell. The people of Medina recited: