Yes they are his sheep. For it is His sheep that knows and hears His voice. Those who are not His sheep don’t know His voice.The ones who enter through him are his sheep. The ones who choose to follow and listen to him are his sheep. His came to his own and his own didn't receive him, but the ones who did became his.
His coming to His own does not refer to His sheep, but to his countrymen, his own race, the Israelites, his brethren in the flesh.
Tong
R1986