Ikrimah (may Allah have mercy on him) narrates from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) wrote to the Jews: "From Muhammad (peace and blessings be upon him), the Messenger of Allah, the brother and companion of Moses (peace be upon him), whom Allah sent with what He sent him. I adjure you by Allah, and by what He revealed to Moses (peace be upon him) on the day of Mount Sinai, who split the sea for you, saved you and destroyed your enemy, fed you manna and quails, and shaded you with clouds: do you find in your Book that I am the Messenger of Allah to you and to all people? If that is so, then fear Allah and accept Islam; and if it is not with you, then there is no blame upon you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20717