Acts 5:21

‘And when they heard this, they entered into the temple about daybreak, and were teaching (or ‘began to teach'). But the high priest came, and those who were with him, and called the council together, and the whole board (senate) of the children of Israel, and sent to the prison-house to have them brought.'

Obedient to God's word the Apostles went without hesitation (‘at daybreak') to the Temple and taught. Meanwhile the High Priest and his cronies in all ignorance of what had happened called together the Sanhedrin and then sent for the prisoners to be brought from the prison house. Note how it is emphasised that it was ‘the whole board of the children of Israel'. Here the contest between Israel and the new people of God is being emphasised. All who represented Israel were against them. It may signify that there were additional Jerusalem city officials other than the members of the Sanhedrin.