None?
Alabama:
"Whereas, the election of Abraham Lincoln and Hannibal Hamlin to the offices of president and vice-president of the United States of America, by a sectional party, avowedly hostile to the domestic institutions…"
"And as it is the desire and purpose of the people of Alabama to meet the slaveholding States of the South…"
Texas:
"WHEREAS, The recent developments in Federal affairs make it evident that the power of the Federal Government is sought to be made a weapon with which to strike down the interests and property of the people of Texas, and her sister slave-holding States…"
Virginia:
"...and the Federal Government having perverted said powers not only to the injury of the people of Virginia, but to the oppression of the Southern slave-holding States"
Again.
Actually the result of my answer is very clear.......none of the Ordinances of Secession contains language that supports any assertion about slavery.