Colossians 1:4
Having heard of (akousantev). Literary plural unless Timothy is included. Aorist active participle of akouw of antecedent action to euxaristoumen. Epaphras (verse Colossians 1:8) had told Paul.
Your faith in Jesus Christ (thn pistin umwn en Ihsou Xristw). See Ephesians 1:15 for similar phrase. No article is needed before en as it is a closely knit phrase and bears the same sense as the objective genitive in Galatians 2:16 (dia pistewv Xristou Ihsou, by faith in Christ Jesus).
Which ye have (hn exete). Probably genuine (Aleph A C D), though B omits it and others have the article (thn). There is a real distinction here between en (sphere or basis) and eiv (direction towards), though they are often identical in idea.
