Based on the provided tafsir, a man can marry a maximum of **four wives** simultaneously.

The primary evidence comes from Surah An-Nisa (4:3), which states: "marry those that please you of [other] women, two or three or four." This verse explicitly limits the number.

Ibn Kathir reinforces this limit through the Prophet's actions. When Ghilan bin Salamah Ath-Thaqafi embraced Islam with ten wives, the Prophet commanded him to "Choose any four of them" (Source 1, 2). This demonstrates that the limit applies even to pre-Islamic marriages upon conversion, solidifying the maximum of four.

Furthermore, Surah An-Nisa (4:24) clarifies that "All others are lawful... provided you seek them (with a dowry) from your property, desiring chastity, not fornication," and Ibn Kathir interprets this as allowing one "to marry up to four wives" (Source 3).

The condition for this allowance is justice: "But if you fear that you will not be just, then [marry only] one" (4:3). This highlights the importance of equitable treatment, acknowledging the difficulty in achieving perfect justice between multiple wives (4:129).

📚 Sources: Classical tafsir (multi-source)