KJV: But when divers were hardened, and believed not, but spake evil of that way before the multitude, he departed from them, and separated the disciples, disputing daily in the school of one Tyrannus.
NASB: But when some were becoming hardened and disobedient, speaking evil of the Way before the people, he withdrew from them and took away the disciples, reasoning daily in the school of Tyrannus.
KJV: But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.
NASB: But encourage one another day after day, as long as it is still called "Today," so that none of you will be hardened by the deceitfulness of sin.
KJV: Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts.
NASB: He again fixes a certain day, "Today," saying through David after so long a time just as has been said before, "TODAY IF YOU HEAR HIS VOICE, DO NOT HARDEN YOUR HEARTS."