Philippians 2:18

Textus Receptus:
το δ αυτο και υμεις χαιρετε και συγχαιρετε μοι

King James:
For the same cause also do ye joy, and rejoice with me.

Comments:
joy, and rejoice with: Paul uses the same two words in the preceding verse about himself. He joys and they joy (or ought to joy--whether it is imperative or indicative is not certain). He joys with them and they (ought to) joy with him. The point is that they are not more important than him just as he is not more important than them. But each has chosen to "esteem other better than themselves" (verse 3) in acknowledgment of the supremacy of Christ.

Expanded Paraphrase:
But it is also true that believers' sacrifices for the sake of God's will being done in other believers also gives you a reason to have joy and to share in that joy with me.