Dawud bin Kurdus states that Sayyiduna Umar (may Allah be pleased with him) made peace with Banu Taghlib on the condition that the sadaqah on them would be doubled, that they would not prevent anyone from accepting Islam, and that they would not dye their children by dipping them in water.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18794
Dawud bin Kurdus narrates from Sayyiduna Umar (may Allah be pleased with him) that he made peace with Banu Taghlib on the condition that they would not dye any child in their religion, that the sadaqah on them would be doubled, and that they would not be compelled to any religion other than their own. Dawud said: Banu Taghlib had no covenant, because they had dyed their children in Christianity.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18795
Ubadah bin al-Nu'man al-Taghlibi said that he said to Sayyiduna Umar (may Allah be pleased with him): O Commander of the Believers, you know the might of Banu Taghlib; they are positioned facing the enemy, and if they back the enemy against you, dealing with them will become hard. If you see fit, give them something. Sayyiduna Umar (may Allah be pleased with him) said: I will give something. The narrator said: Sayyiduna Umar (may Allah be pleased with him) made peace with them on the condition that they would not dye their children in Christianity and that the sadaqah on them would be doubled. Ubadah used to say: They have done it, and they have no covenant.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18796
Al-Rabi' (may Allah have mercy on him) said: Imam al-Shafi'i (may Allah have mercy on him) said at the end of this hadith: The scholars of the military expeditions (maghazi) have also preserved it this way, and they narrated it in a better sequence. They say: When jizyah was imposed on them, they said: We are Arabs; we will not pay jizyah like the non-Arabs, but collect sadaqah (that is, zakah) from us. Sayyiduna Umar (may Allah be pleased with him) said: This is obligatory only upon the Muslims. They said: Then give it some name other than jizyah. So Sayyiduna Umar (may Allah be pleased with him) agreed that the sadaqah on them would be doubled.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18797